As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER CORROSION REMOVAL (UT) MEASUREMENT THICKNESS WAS ACOMPLISHED ON FRAME CLIP ON BS 1500 BTW S-27R AND S-26R AFT CARGO COMPARTMENT, IS OUT OF LIMITS PER B757-300 SRM 53-00-53-1A PROCEDERE 1. CORRECTIVE ACTION: SUMMARY OF NRC 00559. FRAME CLIP ON BS 1500 BTW S-27R AND S-26R AFT CARGO COMPARTMENT WAS REPLACED PER B757-300 SRM 51-40-02-0G PAR 4. (1579000) AIRCRAFT WAS GROUNDED