What was found
*RH WING AILERON CENTER HINGES (LH AND RH) HAVE WEAR MARKS ON BOTTOM SURFACES (C-CHECK RO 6/22/2021) BLENDED OUT DAMAGE AREAS ON RH AILERON LH AND RH CENTER HINGES BOTTOM SURFACE REF. CRJ-900 SRM, 51-12-00-001-001-A01. FOUND TO BE OUT OF LIMITS REF. CRJ-900 SRM, 57-61-02-101-001-A01 AND CRJ-900 SRM, 57-61-01-101-001-A01. COMPLIED WITH REO 690-57-61-206 REV -- DATED: 2021-04-19, ALL STEPS COMPLIED WITH, RESTORED FINISH WITHIN LIMITS.