8M diagnose and replace 3.3v regulator TPS79633DCQ PSU for no start, R500 current limiting resistors +/-9V Main Board for distorted audio, TPS9650DCQ 5v regulator for PGA2500s Main Board for no input, 5v Main Board cap dry joint, replace case screw 6-32 1 1/8.
828 Mk II diagnose and replace input pots for intermittent noise, backlight LED for display
