Intellabeam Controller with stuck Standby button

I've got an Ibeam LCD controller with a standby button that won't turn off and it makes it hard (really hard) to do any shows with it. The mechanical switch works and the wires are sending the proper current. There are no burns on either board, all other buttons work, and all connectors have been resoldered. Any ideas on where to begin on the repair of this guy?
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