What was found
YYC: FUSELAGE INTERIOR UNDERFLOOR, FUSELAGE FRAME TO SKIN FLANGES AT STA X509 BETWEEN STR 33-32S HAS CORROSION. MAINTENANCE REPAIRED IAW Q400 SRM 51-42-05-330-801, SRM 51-21-00-350-801, SRM 51-42-05-330-801, SRM 51-25-10-370-801 AND SRM 51-25-15-370-801.