What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK, MAINTENANCE REPORTED LEVEL 2 CORROSION ON LT OUTBOARD SEAT TRACK AT FS 236 TO FS 564.5. MAINTENANCE REMOVED AND REPLACED LT OUTBD SEAT TRACK AT FS 236 TO 564.5. IAW BOMBDIER Q400 SRM 53-30-49, 51-40-10, 51-42-90, 51-42-05, 51-40-07 AND EO DHC-8-400-53-L01797. AIRCRAFT IS STILL IN HEAVY CHECK.