channel cutting in and out

a "pot" is a potentiometer - which is what controls your volume (ie it's the thing behind the volume knob that actually changes the volume level). It does this by having a "wiper" rub against a variable resistor. If the surface between the wiper and resistor gets dirty then it can cut out. It's not unusual for a 4 year old part to have this problem. The fix is to get contact cleaner and spray it into the Pot which cleans and lubes it.

Great, Thanks for the responces!!
Have a great holiday season.

If the volume control is scratchy you could also try polishing the contacts by rapidly spinning the knob all the way up and down several times with the preamp off.