I gave my Stage 3 88 to a technician to replace the encoder that changes the piano section voices. The D-shaped stem had snapped off. It still worked, but I was just trying to replace it so I could operate with a proper knob.
Said technician swapped out the broken one for a new one, but it was getting no response changing patches. He then put the old one back on, and now it's not changing patches.
He's offering to pay for an entire new board, but I'm trying to troubleshoot before he's out $500. Any suggestions?