What was found
WHILE AC WAS IN FOR HVY CHECK FOUND MAIN CABIN RT AFT WET AREA FLOORBEAM AT RBL 10 FR86 HAS SPOT OF CORROSION. MX REMOVED AND REPLACED UPPER SHEET PN 170-86101-001 IAW SRM 51-75-16, 51-40-08, ETD2011-190/01333 REV C. AC REMAINS IN IND FOR COMPLETION.