What was found
IN RFI FR 68 BTW STR 15L-18L AFT L SHAPE FOUND CORRODED IN LH RFI BWN FR 68-69 BLEED AIR POST DUCT NEEDS TO PARTIALL REMOVED FOR SHEET METAL ACCESS IN L/H RFI BTW FR 68-69 BLEED AIR POST DUCT NEEDS TO BE REINSTALLED-C/A-IN RFI @ FR 68 BTW STR 15L AND 186 DAMAGED SEGMENT OF AFT L SHAPE LENDED OUT OF LIMIT SIAW ETN EM 53-272 AND DISCARDED IAW SRM 53-31-04IN RFI @ FR 68 BTW STR 15L-186 AFT L-SHAPE REAPIRED IAW ETN EM-53-272 AND SRM 53-31-04IN L/H RFI BTW FR 68-69 BLEED AIR AFT POST DUCT REMOVED FOR ACCESS IAW AMM 36-11-09 IN L/H RFI BTW FR 68-69 BLEED AIR AFT POST DUCT RE-INSTALLED IAW AMM 36-11-09