What was found
YYC - LEFT WING AFT SHROUD AREA AT STA 169, ON O/B FLAP ROLLER GUIDE FITTING CHAFED BY FLAP ROLLER FITTING. MAINTENANCE REPAIRED IAW REO 670-57-51-036, CRJ-700 NDTM PT 1, 51-20-006, SRM TASK 51-24-11-001-001-A01 AND FIELD P.S.18.0, CRJ 700/900 SRM 51-21-16, AND CRJ 700/900 SRM 51-42-21-001-001-A01.