What was found
AFT FUSELAGE FLOORBEAM UPPER SHEET CORRODED FROM FR85 AFT APPROX 14" AT Y=10.748. REMOVED AND REPLACED UPPER SHEET REF. SRM 51-40-08. RESTORED SURFACE PROTECTION REF. SRM 51-23-04, 51-23-05, AND 51-23-06. SEE W/O H6609 SN 583 FOR WORK DETAILS. AIRCRAFT REMAINS IN HEAVY CHECK BNA.