What was found
DURING HEAVY MAINTENNACE, CORROSION WAS DISCOVERED ON AFT CABIN FLOOR SUPPORT Y464, FRAME 66 ON UPPER FACE; REMOVED CORROSION VERIFIED BEYOND ALLOWABLE LIMITS. R & R THE FLOOR SUPPORT BETWEEN FRAMES 64 - 67 IAW SRM 53-00-14-283-002, AND 51-42-11.