As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION FOUND THE APU FIREWALL HAS CRACK 1.5 INCHES LONG PROTRUDING FROM UNDER RIGHT UPPER MOUNT. THE AIRCRAFT WAS REMOVED FROM SERVICE. COMPLIED WITH REPAIR IAW EO EM-53 AD 1883 AND ETN EM -53-244. THE AIRCRAFT WAS RETURNED TO SERVICE.