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...