As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON THE APU AIR INLET DOOR INTERIOR FWD FLANGE, UNDER THE NUTPLATES, AND THE FWD FLANGE IS EXFOLIATED WITH CORROSION BETWEEN THE FLANGE AND FUSELAGE SKIN. REMOVED THE APU AIR INLET DOOR ASSY, AND FABRICATED AND REPLACED THE UPPER AND LOWER FLANGES, AND REINSTALLED THE APU INLET DOOR ASSEMBLY IAW B757 AMM 49-15-01. OPERATIONAL CHECK GOOD.