Fault Channel Fader

Hi,

Channel 2 has produced a fault whereby when you move the fader up to max it doesn't always register at full.  If you tap it slightly the volume increases.  I've checked with a Midi OX and the signal is fluctuating between 124-127.  Does anyone know if this can be repaired and is it a large job to do?  I haven't taken the SX apart so unsure how the circuitboard is set out.  Hopefully just a case of repacing channel 2 components or fader.

Any help would be greatly appreciated.