What was found
AIRCRAFT WAS NOT GROUNDED AND IS IN CHECK FOR SCHEDULED MX. MAIN CABIN AFT WET AREA RIGHT FLOOR STRUCTURE BEAM Y-765 BETWEEN FR66 TO FR70 HAS CORROSION. REMOVED AND REPLACED MAIN CABIN AFT WET AREA RIGHT FLOOR STRUCTURE BEAM Y-765 BETWEEN FR66 TO FR70 IAW A320 SRM 51-42-11, 51-44-11, 53-41-14-283-009, 51-75-12. MX ACTION IS ACCEPTABLE.