Hi DonP,
I don't have experience with the MFC10, but if you move your gear around gigging, a lot of times malfunctions can be traced to a simple solder joint coming loose. I had this happen on the Main Outs of my Korg Triton Extreme.
With something like a pedal board, it's probably even more likely with the kicking and abuse it gets. You might want to try to open the case and have a look around. If it looks dastardly complex, close it up and bring it to the experts. If it looks like simple engineering, try to find the section of the PC board or wires connected to the 1st switch and see if you can refresh the solder joints with a hot soldering iron.
Be Brave my friend!
Al
_________________________
Al
Pa4x - LD Systems Maui 28 - Mackie Thumps