What was found
WHILE AC WAS IN FOR HEAVY CHECK FOUND AFT CABIN FLOOR AT FR 89 RBL 10" HAS CORRODED PLATE. MX REMOVED AND REPLACED FLOOR BEAM PLATE AT FR 89 RBL 10", PN 170-86125-001 IAW SRM 51-75-16, 51-40-08, 51-40-02. AC REMAINS IN IND FOR COMPLETION.