As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ON GROUND DURING PREFLIGHT, MAINTENANCE FOUND WRINKLED SKIN IN VICINITY OF APU FIRE EXT INSPECTION PORT. INSPECTED DENTED AREAS IAW SRM 53-30-01 PAGE 2A, NO CRACKS FOUND, DENTS ARE SMOOTH. REINSPECT EVERY 250 CYCLES WITH PERMANENT REPAIR NEXT HEAVY CHECK. ISSUED DEFERRED MAINTENANCE ITEM.