What was found
FLC FUSELAGE STATION 470, BL0 UNDER DOUBLE WING LOCK SCREW HAS PUNCTURED THE SKIN OF U CHANNEL, DIRECTLY ABOVE EQUIPMENT COOLING OUTLET MOTOR. UPON INSPECTION PUNCTURE FOUND HAD CRACKS. R & R WEB IAW SRM 51-40-02. REINSTALLED WING LOCK SUPPORT IAW SRM 51-40-02. REINSTALLED CTR & AUX WING LOCKS IAW AMM 25-53-14-4. SDR INFO CRACKED 1/4 INCH, PN 452T2055Y4, PART NAME WEB, SN NSN, FS & BS LOCATION 470 TO 470, STRINGER & WS LOCATION LBL 10 TO RBL 20. ACFT WAS GNDED.