What was found
UPPER WING TE PANEL, ATTACH CHORD AT WING TO FUSELAGE JUNCTION, ABOVE UPLOCK CYLINDER, CORRODED AROUND NUTPLATES. REMOVED ATTACH CHORD & INSTALLED SERVICEABLE ATTACH CHORD, PN 113T1621-55 IAW SRM 51-40-2. CORRODED LEVEL 2, PN 113T1621-55, PART NAME ATTACH CORD. ACFT WAS GNDED.