Footswitch problem

[atonal]

I'm having a problem with the footswitch on my Mark IV. The R1, R2, and Lead switching is fine, so is the EQ and FX loop, but the Lead-EQ switch doesn't work. Does anybody know what might be the problem? Is it fixable or should I just replace the footswitch itself? Or if it isn't the footswitch but the amp itself?

Chad S.