What was found
DURING C-20 CHECK CORROSION WAS FOUND AT THE L-1 DOOR SILL INNER CHORD UNDER DRAIN TROUGH BS 333, LBL 50. MAINTENANCE REMOVED 2 EACH ANGLES AT BS 312 AND 344, A WEB AT BS 277 - 306, A FRAME BS 300, AND AN ANGLE BS 277 - 284 FOR ACCESS, REMOVED DAMAGED DOOR SILL INNER CHORD AT BS 333, LBL 50; FABRICATED A NEW REPLACEMENT DOOR SILL INNER CHORD; INSTALLED REPAIR PART AND REINSTALLED 2 EACH ANGLES, WEB, FRAME, AND ANGLE, IAW DWG 65-17688, B737-200 SRM 51-10-1, PG. 8, AND SRM 51-30-2, PG. 2-5.