What was found
BOI FLIGHT NR 2237: NR 2 PROP FAILED TO COME OUT OF FEATHER FOR APPROXIMATELY 5 MINUTES AFTER ENGINE START. AIRCRAFT RETURNED TO BLOCK. MAINTENANCE REMOVED AND REPLACED NR 2 PROP OVER SPEED GOVERNOR WITH SERVICEABLE UNIT IAW Q400 TASK 61-20-26-000-801 FOR REMOVAL AND TASK 61-20-26-400-801 FOR INSTALLATION. C/W OPS CHECK OF THE OSG IAW TASK 61-20-00-710-803 OF Q400 AMM. OPS TEST GOOD. C/W FUNCTIONAL TEST OF THE PROP TIME TO UNFEATHER IAW Q400 MM TASK 61-20-00-720-801. OPS CHECK GOOD. NO OTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.