As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION, A CRACK WAS FOUND IN THE APU FIREWALL AT APPROXIMATELY THE 2 O'CLOCK POSITION NEAR AN EXISTING DOUBLER. MAINTENANCE REMOVED THE EXISTING DOUBLER AND PERFORMED A COMBINATION REPAIR IAW SRM 53-32-13 AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.