Marshall AVT100 Valvestate 2000 Combo Amp- DFX not working

[brady]

Hey everyone, I'm new here so be gentle. I purchased a Marshall AVT100 Valvestate 2000 1x12 combo amp off of a coworker of mine because he gave me a good...

[asweaterfriend]

I have had this amp for years and is still sounds great. The only problem is that the Digital FX do not work. It has been like this for 3 of 4 years but...