Bill,
If I recall, didn't you say there were some bad buttons on the keyboard, ones that didn't work unless you mashed down hard on them? If this is the case, and those buttons have not been changed, there's a good chance that one or more of them is possibly making a connection when it should not.
Additionally, as I stated so many times in the past, smoke-filled rooms trash keyboards, fan-cooled amps, mixers, mics and a host of other very expensive electronic gear.
Good Luck,
Gary
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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)