What was found
WHILE THE ACFT IS IN HEAVY CHECK MAINT FOUND CORROSION STRUCTURAL CENTER FUSELAGE III DRY AREA 53-23 LT SEAT TRACK FRAME 84. REMOVED AND REPLACED LT SEAT TRACK AT FR 84.RESTORED SURFACE PROTECTANT TO LT SEAT TRACK FRAME 84 FILLER AND SPLICE REF SRM 51-23-04, 51-23-05, 51-23-06.