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It's possible that the Harmony foot switch has become damaged or faulty. One thing you could try is to unplug the pedal from power, disconnect the footswitch from the unit, and then reconnect it to see if that resolves the issue. If that doesn't work, it could be a more serious issue that requires repair or replacement of the footswitch. You may want to try contacting Digitech customer support to see if they have any troubleshooting suggestions or if they can provide guidance on where to find a service agent in your area.
The buttons are probably scanned as a matrix and possibly a circuit board has been cracked causing wrong data to go to the microprocessor in it. It is unlikely this will be a DIY fix so you should contact Digitech for a repair facility.
Try a factory reset. This is the procedure 1. Press and hold the Store button while powering up the RP90. 2. When the display prompts you with FR, release the Store button. 3. Press and hold the Store button for 3 seconds until RS appears in the display and release. The Factory Reset procedure takes approximately 10 seconds. 4. Once the factory reset has finished you will need to calibrate the Expression Pedal.
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