As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION TO BS 1088 BULKHEAD AUXILIARY POWER UNIT PLENUM. REPLACED LEFT VERTICLE STIFFENER AT APU INLET CUTOUT STATION 1088 AND REPLACED ALL TEMPORARY FASTENERS WITH SOLID RIVETS PER AARD 51-10-05, BOEING DRAWING 148A0924 AND EA B737-53-007645.