Replacing Line6's footswitches for more robust ones is the #1 service offered by modder-companies.
M5, M9, M13
DL-4
etc
etc
A friend of mine was an early-adopter of Line6 stuff, and he still has an amp with a foot-controller (not sure if it's the same as yours) —
he gets calls from people he doesn't even know asking if he'll sell the foot-controller. People hear through the grapevine he still has the amp and foot-controller and I guess a lot of the foot-controllers for the amp got wrecked, lost or stolen. He could sell it for a pretty penny, but then he'd have the amp still with no way to fully utilise it.