My brother-in-law's S2000 machine keeps throwing a "general reel tilt" code. Sometimes you're able to play 5 or 6 games before it tilts, other times it will tilt out on the 1st play. It's not always one reel that starts the "slow spin". It can be all three, the third reel, or the 2nd & 3rd. I'm able to reset the machine by opening the door, then turning the jackpot key. I tried swapping out the reels one at a time with reels from a working machine. Disconnected the reel harness & re-connected it. Pulled the MPU board, removed whatever chips I could and re-seated them. All of this made no difference. Coin battery checks out at 2.71V, but I don't think that's the problem since there's no "low battery" message. I don't much about these IGT machines. Looking for some direction as to what to try next. Machine model # is 96438300.