Hello,
Did you get an answer to this question because I have the same problem.
I have done an extensive internet search to no avail.
So, I shall endeavour to open the unit myself to repair a simple job. If I destroy the unit in the process no problem. I will buy something to replace it from another brand, checking that I can open it if need be.
Line 6 do not assist with any hardware problems, instead stating that any repairs need to be carried out by a registered repairer in the country that the person is living.
Quite unsatisfactory really. I can and have done repaired other named brands I own.
Inbuilt obsolescence. Needless to say I won't be purchasing any other Line 6 gear.
Cheers