Welcome to the forum, JT3.
You might want to stop by the Fret Players forum and introduce yourself.
Those modelling amps use very complex digital circuitry. It could be any number of things. Your best bet would be to take it to a tech that is certified by Line 6 or is experienced in servicing their gear.Originally Posted by JT3
You might want to email Line 6, a tech there might be already familiar with common problems with your particular amp. I would ask for a recommendation for a tech to take it to, if you go the email route.