What was found
SHV - DURING C CHECK, THE LEFT OMEGA BEAM WAS FOUND TO BE CORRODED AROUND THE COMPOSITE CROSS BEAM AT FRAME 20. MAINTENANCE REMOVED THE DAMAGED AREA AND INSTALLED A SHIM FILLER REPAIR IAW EMB 145 SRM 53-00-10, SECTION 1, FIG 201, SHEET 1. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.