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 APPROXIMATELY 1.25" TOTAL LENGTH AT THE 9 O'CLOCK POSITION WITH A RIVET IN THE MIDDLE. MAINTENANCE PEFORMED A DOUBLER REPAIR, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.