Anyone ever have this problem? I just picked up a semi-broken SP88 for dirt cheap and there was one key that was much louder than the rest. Upon running the diagnostic tests, I determined that the G2 key has a defective "first switch". Anyone ever dealt with this before? I'm in the habit of buying and fixing broken gear (generally successfully) and I'm pretty good at dealing with circuitry, but I thought I'd check here to see if anyone can specifically pinpoint what this means before I pop it open and try to figure it out myself...