The first thing to try would be a factory reset:
Press and hold the "User/Preset" and "Save/Store Sounds" buttons and keep holding them as you turn the amp on.
If that does not correct the problem, the next step is to contact a Line 6 Service Center in your area, and inquire about getting the amp serviced. Keep in mind, because of the age of this amp, replacement parts for this amp might not be available.
You can locate a Line 6 Service Center using the link below:
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