What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON REF NR 40597 R1 PAX DOOR SILL, FRAME 20 STR 23R. HAS 4 EA AREAS OF CORROSION AROUND GIRT BAR FITTING ATTACH HOLES; REF NR 40597 AREA PREVIOUSLY BLENDED AT AFT I/B HOLE. AREA IS WITHIN LIMITS. REMOVED AND REPLACED R1 DOOR SILL IAW SRM 51-72-11-911-001.