Record, Overdub, Play and Stop Button Not Working

My record, overdub, play and stop buttons on my MPC 1000 just went out all of a sudden a few days ago. I changed the tact switches on the original right PCB board and no change. I purchased another right PCB board from MPCstuff.com and no change. Has anyone had this happen to them? The only thing I can think of that's left to mess around with is the cable that brings power to the right PCB board. Does MPCstuff.com sell that wire individually? I'm running out of ideas here.

For the record, I'm running Akai OS 1.06 and cannot upgrade to another OS since the stop button is not functioning.