What was found
***CORROSION*** ON SEAT TRACK @ 12.5 INCHES FWD OF FR74 TO 2 INCHES AFT OF FR74, RBL43, WL151.5. REMOVED AND REPLACE SEAT TRACK BETWEEN FR57+13" TO 74+6" RBL43, WL 151.5 IAW BOMBARDIER DWG: C01342701, REV G AND A220 ASRP BD500-A-J51-42-21-00AAA-078A-A. (LP# 0901002)