As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6405 MCO-BNA, ON HEAVY MAINTENANCE CHECK FOUND AFT SERVICE DOOR LOWER BEAM 4 AFT FR 8 STRINGER 17R AT RIVET HOLE SIZE OF DEFECT. W=.580 X .580 NORMINAL .157" REMOVED .055" MATERIAL REMOVED 35 PERCENT REF N/R 8548. ACCOMPLISHED TASK CARD E12-358-01. REMOVED THE CORROSION BY MEANS OF A SPOT FACE REWORK WITH MINIMAL REDUCTION. HFEC INSP, COUNTERSUNK AND WET INSTALLED RIVET ALODINED PRIMED AND COATED PER E12-358-01.