I am having a problem with another Bogen Multicom 2000 unit. This one has three station banks. ( MCRC ) The third is only using the first 12 stations. Had little or sound on theses stations. Found one fuse blown on MCACB. Replaced fuse, it held, checked system, could only hear, no announce, could call. Pulled board, found one heat sinked module running very hot. Replaced card with one from an unused bank,fuse blew again. Removed all 12 station terminations. Replaced card and fuse, still blew. At the moment I do not have another MCRC board. Does this look like the problem. are these systems prone to mother board issues. Thanks for any input...

They are not that problematic. If you roll as a pair the MCACB and MCRC to another slot and flip the known good to that slot where does the problem manifest? The problem you describe normally relates to something connected to the MCRC, yet you say the fuse blew with nothing connected. Also beware that MCRC's connected directly to the power amp have a different configuration.
Regards