As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) PASSENGER SERVICE UNITS (PSU) FAULTY. INVESTIGATION FOUND PSU CONTROL CIRCUIT BOARDS HAD BEEN HEAT DAMAGED. INVESTIGATION INTO THE CAUSE OF THE CIRCUIT BOARDS DAMAGE REVEALED THAT THE WIRE ON THE OUTLET SIDE OF ALL OF THE PSU CONTROL CIRCUIT BOARDS HAD CHAFED INSULATION ALLOWING SHORT CIRCUIT TO GROUND. THIS UNCONTROLLED SHORT CIRCUIT RESULTED IN THE OUTLET TRANSISTOR BURNING OUT ON ALL PSU CONTROL CIRCUIT BOARDS.(CASA NR 510001591)