What was found
SHV - DURING C-CHECK (ZONE - 311) EXTERNAL SKIN AT FRAME 79, HAS (5) SKIN CRACKS AT RIVETS (.059", .074", .061", .046" AND .017'). MAINTENANCE PERFORMED REPAIR ON ZONE 311 EXTERNAL SKIN AT FRAME 79 (5) PLACES IAW EC 5330-02012. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.