I have a mid 80's BMC 50 That had an issue with the Program entry board shorting out. I believe whatever caused it was in the front panel (pedestal) board wiring to it. The ways on the machine are very worn, it worked great as a drill press, but unreliable when it ran anything where the bed had to move. In the past 5 years I have replaced The servo amp, power supply, memory board and a few other things. If anyone needs anything from the machine PM me with contact info.