DL360G8 displays fan failure in fan slot4 only.

I have a customer with an HP ProLiant DL360 G8 server that displays fan failure in fan Slot 4 but fans that have be inserted in that slot seem to be functioning normally. I've inserted a new fan and swapped fans around in the system in and out of that slot but it still reports failures and there's no temperature issues have been reported.
There are two processors and all 8 fan slots are populated.
Can you give me some guidance as to what the issue may be?
The BIOS firmware level is P71-09/08/2013 and is probably pretty far out of date but I'm not ruling out MB issue.
Thanks for any help
PhillyGeeAsked:
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Casey WeaverManaged Services Windows Engineer IIICommented:
The first recommendation would be to update the server with an HP SPP (Service Pack for ProLiant). It could be a sensor that has lost calibration or an iLO firmware issue. Beyond that, it will most likely be a mainboard problem. You'll need an active HP maintenance contract on the server to get access to the SPP.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Backplane fault
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andyalderSaggar maker's framemakerCommented:
Unfortunately there isn't a fan backplane they plug directly into the motherboard. The fans are hot-plug if you can get the server lid off without pulling all the cables out and it will run ok but loudly with a fan missing.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Backplane fault on the motherboard!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Motherboard duff!
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