DNS record in "_msdcs" missing

I have a cluster with active directory (windows 2003 R2)

all event viewer are good, no errors, no warnings... so everyting is good... but..
When I look in the DNS, forward lookup zones, domain.com, _msdcs, I only see one of my DC. cluster1, but nothing about cluster2....

I try to find out on google and I found the command netdiag /fix and I have errors...
I try to add manually the record in _msdcs and ran the netdiag /fix again... same errors
here is the resualt:

C:\Documents and Settings\Administrator.DOMAIN>netdiag /fix

....................................

    Computer Name: PAIN-CLUSTER2
    DNS Host Name: pain-cluster2.domain.com
    System info : Microsoft Windows Server 2003 R2 (Build 3790)
    Processor : x86 Family 6 Model 15 Stepping 6, GenuineIntel
    List of installed hotfixes :
        KB921503
        KB924667-v2
        KB925398_WMP64
        KB925876
        KB925902
        KB926122
        KB927891
        KB929123
        KB929969
        KB930178
        KB931768-IE7
        KB931784
        KB931836
        KB932168
        KB933360
        KB933566-IE7
        KB933729
        KB933854
        KB935839
        KB935840
        KB935966
        KB936021
        KB936357
        KB936782
        KB938127-IE7
        KB939653-IE7
        KB941202
        Q147222


Netcard queries test . . . . . . . : Passed



Per interface results:

    Adapter : PRIVATE

        Netcard queries test . . . : Passed

        Host Name. . . . . . . . . : pain-cluster2
        IP Address . . . . . . . . : 10.1.10.21
        Subnet Mask. . . . . . . . : 255.255.0.0
        Default Gateway. . . . . . : 10.1.10.2
        Dns Servers. . . . . . . . : 10.1.10.21
                                     10.1.10.20


        AutoConfiguration results. . . . . . : Passed

        Default gateway test . . . : Passed

        NetBT name test. . . . . . : Passed
        [WARNING] At least one of the <00> 'WorkStation Service', <03> 'Messenge
r Service', <20> 'WINS' names is missing.

        WINS service test. . . . . : Skipped
            There are no WINS servers configured for this interface.

    Adapter : HEARTBEAT

        Netcard queries test . . . : Passed

        Host Name. . . . . . . . . : pain-cluster2
        IP Address . . . . . . . . : 172.25.0.2
        Subnet Mask. . . . . . . . : 255.255.255.0
        Default Gateway. . . . . . :
        NetBIOS over Tcpip . . . . : Disabled
        Dns Servers. . . . . . . . :

        AutoConfiguration results. . . . . . : Passed

        Default gateway test . . . : Skipped
            [WARNING] No gateways defined for this adapter.

        NetBT name test. . . . . . : Skipped
            NetBT is disabled on this interface. [Test skipped]

        WINS service test. . . . . : Skipped
            NetBT is disable on this interface. [Test skipped].


Global results:


Domain membership test . . . . . . : Passed


NetBT transports test. . . . . . . : Passed
    List of NetBt transports currently configured:
        NetBT_Tcpip_{19FCD08A-A383-4D45-8FFC-8B658604141E}
    1 NetBt transport currently configured.


Autonet address test . . . . . . . : Passed


IP loopback ping test. . . . . . . : Passed


Default gateway test . . . . . . . : Passed


NetBT name test. . . . . . . . . . : Passed
    [WARNING] You don't have a single interface with the <00> 'WorkStation Servi
ce', <03> 'Messenger Service', <20> 'WINS' names defined.


Winsock test . . . . . . . . . . . : Passed


DNS test . . . . . . . . . . . . . : Passed
          [WARNING] Cannot find a primary authoritative DNS server for the name
            'pain-cluster2.domain.com.'. [ERROR_TIMEOUT]
            The name 'pain-cluster2.domain.com.' may not be registered in DN
S.
    PASS - All the DNS entries for DC are registered on DNS server '10.1.10.21'
and other DCs also have some of the names registered.


Redir and Browser test . . . . . . : Passed
    List of NetBt transports currently bound to the Redir
        NetBT_Tcpip_{19FCD08A-A383-4D45-8FFC-8B658604141E}
    The redir is bound to 1 NetBt transport.

    List of NetBt transports currently bound to the browser
        NetBT_Tcpip_{19FCD08A-A383-4D45-8FFC-8B658604141E}
    The browser is bound to 1 NetBt transport.


DC discovery test. . . . . . . . . : Passed


DC list test . . . . . . . . . . . : Passed


Trust relationship test. . . . . . : Passed
    Secure channel for domain 'DOMAIN' is to '\\pain-cluster1.domain.com
'.


Kerberos test. . . . . . . . . . . : Passed


LDAP test. . . . . . . . . . . . . : Passed


Bindings test. . . . . . . . . . . : Passed


WAN configuration test . . . . . . : Skipped
    No active remote access connections.


Modem diagnostics test . . . . . . : Passed

IP Security test . . . . . . . . . : Skipped

    Note: run "netsh ipsec dynamic show /?" for more detailed information


The command completed successfully

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since those 2 servers are in cluster, I can not demote the DC, can not uninstall DNS....

what can I do to solve that issue?
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