Currently starts working at a grade school with a LMI Ch200 console, L86 wall pack, with LM86 2400 dimmer modules. They are having problems getting all the lights to work. They have had some of the light bulbs replaced and they worked for a while. They seem to think that the console has shorted out and only about 4 channels are working. Can I get some direction on where to start to diagnose the system without making it worse? Thanks