What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, MAINTENANCE REPORTED LEVEL 2 CORROSION AT THE (MAIN CABIN) RT AFT WET AREA, FLOOR WEB ASSY AT RBL 10 FR 87 TO FR 88 TO RBL 40. MAINTENANCE REMOVED AND REPLACED THE SHEAR PANEL WEB ASSY AT RBL 10 FR 87 TO FR 88 TO RBL 40 IAW SRM 53-23-10, 51-40-08 AND ETD2011-190/01333 REV C. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK.