My chicago electric plasma cutter 36 Amp stopped cutting- the switch light stayed on even in the off position- air flows through the nozzle- it sparks weakly- the power light is on as is the cutter light when the trigger is pulled. took the cover off and blew air to clean dust all connection seem to be tight- now the switch turns off in the off position but still no cutting- nozzle has all new electrodes etc. no diff. does anyone fix these where should i start looking i use only for hobby sculpturing