Got a fairly old Jands Event Plus lighting desk that seems to give trouble. Sometimes it is the faders that need replacing, which is a pain. You have to turn the desk over, after removing all of the fader knobs. And then remove the 12 or more screws to access the guts. Then is the fun task of removing the circuit boards and then carefully de-soldering the faders. Removeing faders from the boards can be tricky and you have to be careful that you don't damage the tracks. When you relpace it you need to make sure you push the fader down firmly and then check that it sits at the right hieght. Then you can begin the task of putting it all back together, only to discover another fader needs replacing. Occasionally get a software glitch, just not game to find out what that is going to cost.