Port forwarding on Firebox XTM 2 series, with a little twist

I already have a machine to which traffic through a WatchGuard Firebox XTM2 series is directing RDS traffic via port 3389.  

To remote in to a second machine, I want to accept traffic on port 3390, but send it to another machine on 3389.  Can't see how to do this on a WatchGuard XTM.

Can anyone help?  Thanks.
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DaveWWWAuthor Commented:
As I was going through this I discovered that the company had a bank of static IPs, and so I was able to do the port forwarding in the simplest way, by using a different Internet IP. Thanks though for that info.
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