What was found
WHILE ACFT IN HEAVY CHECK MAINT FOUND CORROSION STRUCTURAL CENTER FUSELAGE III WET AREA LH SPLICE FRAME 87-88, REMOVED, LOCATED, DRILLED, AND COUNTERSUNK CENTER FUSELAGE III WET AREA LH SPLICE FRAME 87-88. REF SRM 51-40-08, 51-40-02, 51-40-04. INSTALLED CENTER FUSELAGE III WET AREA 53-23 LH SPLICE FRAME 87-88. REF SRM 51-40-08 APPLIED SURFACE PROTECTION TO CENTER FUSELAGE III WET AREA LH SPLICE FRAME 87-88. REF SRM 51-23-06. ACFT REMAINS IN HEAVY CHECK UNTIL COMPLETION.