What was found
DURING HEAVY MAINTENANCE, CORROSION WAS DISCOVERED ON AFT CABIN FLOORBEAM Y-1292, FR 68-69, STR 23. MEAS 1.5'L X .90"W X .097"D. P/N: D 53472189204; REMOVED AND REPLACED THE AFT CABIN FLOORBEAM Y-1292, FR 68-69, STR 23R, IAW SRM: 51-72-11.