As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY MAINTENANCE, "FROM TOMX NR 00300, INITIAL INSPECTION: ""CPCP FINDING"" CORROSION IN FASTENER PERIPHERY LOCATED OVER MACHINED BEAM BETWEEN STRG 27R/28R AND FR 77 IN AFT CARGO DOOR CUTOUT STRUCTURE" ; "FROM TOMX NR 00300, INITIAL INSPECTION: ""CPCP FINDING"" CORROSION IN FASTENER PERIPHERY LOCATED OVER MACHINED BEAM BETWEEN STRG 27R/28R AND FR 77 IN AFT CARGO DOOR CUTOUT STRUCTURE" (CONSIDERED A MAJOR REPAIR)