As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHV - DURING C CHECK, THE APU FIREWALL WAS FOUND TO BE CHAFED. DAMAGE WAS FOUND TO BE GREATER THAN 50 PERCENT OF MATERIAL THICKNESS. MAINTENANCE REMOVED THE DAMAGED AREA AND INSTALLED A DOUBLER AND FILLER REPAIR IAW EC 5330-01359, SEC 1.3. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.