As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION, THE APU FIREWALL WAS FOUND TO BE CRACKED AT THE LT BOTTOM FRAME ATTACHMENT POINT. MAINTENANCE REMOVED THE DAMAGED SECTION OF FIREWALL AND PERFORMED A FILLER/DOUBLER REPAIR IAW SRM 53-32-12, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.