What was found
AFTER ENGINE SHUTDOWN, THE NR 1 PROPELLER DID NOT FEATHER COMPLETELY. CHECKED CDS, NO FAULT CODES. WAS ABLE TO DUPLICATE NR 1 PROP NOT COMPLETELY FEATHERING. C/W FUNCTIONAL TEST OF THE PROP TIME TO UNFEATHER. TEST FAILED. R & R THE NR 1 OSG IAW AMM 61-20-26-000-801 AND 61-20-26-400-801, PARA 1-5C. OP'S AND LEAK CHECK GOOD. TIME TO UNFEATHER NR 1 PROP GOOD IAW TASK 61-20-00-720-801. NR 1 PROP FULLY FEATHERED ON ENGINE SHUTDOWN. NO FAULTS IN CDS. ACFT OK FOR CONTINUED SERVICE.