What was found
DURING A HEAVY MAINTENANCE INSPECTION, TWO RAISED AREAS NOTED ON TOP SURFACE OF WING TRAILING EDGE FORWARD OF NUMBER 6 SPOILER. AREA OF THE LEFT WING UPPER CHORD (PN113T1406-7) FORWARD OF THE NR 6 SPOILER (WS 227 TO WS 314) FOUND CORRODED. FABRICATED REPAIR CHORD USING BAC1506-2633-7075-T6511 AND INSTALLED PER BOEING 767 SRM 51-40-05 AND 51-40-02. WORK ACCOMPLISHED ON WO #600320264 AND N774AX-57 WO 32816; ACFT WAS GROUNDED.