What was found
LT FWD DOUBLER (FLOOR) FR 13-16 LBL 14"-36" HAS CORROSION AT FR 16. REMOVED AND REPLACED DOUBLER 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 399 FOR WORK DETAILS. AIRCRAFT REMAINS IN HEAVY CHECK BNA.