What was found
YYC: FUSELAGE INTERIOR UNDERFLOOR, FUSELAGE FRAME TO SKIN FLANGE AT STA X664 BETWEEN STR 33-32P HAS CORROSION AND AFT SIDE OF FRAME WEB BETWEEN STR 32S-32P HAVE CORROSION. MAINTENANCE REPAIRED IAW Q400 SRM 51-42-05-330-801, SRM 51-40-07-320-801, SRM 51-21-00-350-801, SRM 51-21-10-370-801 AND SRM 51-25-15-370-801.