What was found
SEA - ON APPROACH THE RIGHT OUTBOARD ROLL SPOILER FULLY EXTENDED, STAYED EXTENDED UNTIL TOUCHDOWN. LANDING WAS UNEVENTFUL. MAINTENANCE REMOVED THE FLIGHT DATA RECORDER FOR DOWNLOAD AND ANALYSIS. BOMBARDIER FDR ANALYSIS SHOWS IT WAS NOT A FULL DEPLOYMENT, BUT A 55 DEGREE DEPLOYMENT OVER 50 SECONDS. FULL DEPLOYMENT IS 75 DEGREES. REMOVED AND REPLACED RT OUTBOARD SPOILER PCU IAW Q400 AMM TASK 27-61-16-000-801/400-801. REMOVED AND REPLACED RT LIFT DUMP VALVES IAW Q400 AMM TASK 27-62-01-000-801/400-801. OPS CHECK GOOD. NO LEAKS NOTED. C/W FUNCTION CHECK OF ROLL SPOILER SYSTEM IAW Q400 AMM TASK 27-61-00-720-801. FUNCTION CHECK GOOD. NO DEFECTS. AIRCRAFT RETURNED TO SERVICE. LIFT DUMP VALVES (P/N 395800-1005) S/N'S 5126 & 5123 BOTH AT 6,627 HOURS (TSN).