As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT C-CHECK, FOUND PLATE TO KEEL BEAM TOP SIDE UNDER THE APU LOWER SIDE IS CHAFED THROUGH BY THE APU. REMOVED AND FABRICATED PLATE AT KEEL BEAM TOP SIDE UNDER THE APU LOWER SIDE. TREATED AND PRIMED AREA AS PER SRM 51-30-2. INSTALLED KEEL BEAM PANELS PER M/M 20-80-1.