As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DISCREPANCY: DURING C-CHECK AT BQK, STAMBAUGH AVIATION FOUND CORROSION ON THE LH KEEL BEAM IN THE AFT LOWER CARGO PIT BETWEEN FUSELAGE STATIONS 950-1010.CORRECTIVE ACTION: STAMBAUGH AVIATION IN BQK, REMOVED AND REPLACED THE LH KEEL BEAM BETWEEN STATIONS 950-1010 IAW B727 SRM 51-30-2. THEY PERFORMED AN HFEC INSPECTION OF THE NEW INSTALLED LH KEEL BEAM IAW B727 NDT MANUAL PARAGRAPH 6 51-00-00 PROCEDURE 23. NO DEFECTS NOTED AT THIS TIME