What was found
AFTER TAKEOFF, SHORTLY AFTER GEAR RETRACTION, NR 1 ENGINE MADE A LOUD SOUND, THEN NOTICED NR 1 PROP AT APPROX 400 RPM AND TORQUE 125, PLUS FOR APPROX 30-60 SECONDS BEFORE CREW SHUTDOWN ENGINE, AUTOFEATHER SELECTED AND ARMED. NO UPTRIM INITIATED. INSPECTED NR 1 ENGINE AND PROP, NO DEFECTS NOTED. OIL QUANTITY GOOD. NO LEAKS NOTED. CREW DRY MOTORED ENGINE, NO OBVIOUS DEFECTS HEARD. CREW GROUND RAN ACFT WITH MX MONITORING, ALL TEST COMPLETE. ALL SYS OPS CHECKED NORMAL PERFORMED NR 1 PROP SPINNER OFF CHECKS IAW MM 61-10-00. NO DEFECTS NOTED. OIL LEVEL GOOD. PERFORMED NR 1 RGB SCAVENGE FILTER AND CHIP DETECTOR INSPECTION, NO CONTAMINATION FOUND. LEAKED CHECKED GOOD IAW MM 72-01-50. ENGINE WILL BE R & R.