Tony,
Before you send in your controller for repair, could you clarify a few things for us? When you say that Resource Manager (resman) runs successfully what do you mean? Does it find all the devices in the chassis? Or does it just complete without locking up or failing? Also, which 1394 boards have you swapped out, VXI-1394 cards or PCI-1394 interfaces?
The reason for the first set of questions is if you are able to find and recognize all the devices in your VXI chassis when running resman, then that is an indication that the board is working, and that there is some other problem with your system.
Also, have you tried changing the address of the VXI-1394 card or resetting the EPROM or anything like that? Please let us know.
Thanks,
Logan S.