As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING REMOVAL OF RT RECIRC FAN FOUND RECIRC FAN CONNECTOR WIRES BURNED. UPON FURTHER INSPECTION FOUND STRINGER BURNED. INCORRECT INSTALLATION OF WIRE HARNESS ALLOWING RUBBING OF WIRES AGAINST THE STRUCTURE, THIS CAUSED SHORT CIRCUIT OF AT LEAST ONE OF THE WIRES LEADING TO ARCING. AS PART OF CORRECTIVE ACTION, AN EG CALLOUT HAS BEEN ISSUED TO INSPECT THE REST OF THE FLEET TO INSURE HARNESSES ARE CORRECTLY INSTALLED WITH CLAMPS AND STANDOFFS.