As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SIGNIFICANT EVENT - FLIGHT 5128 EN ROUTE FROM PIR TO DEN DURING APPROACH INTO DENVER ON FINAL AT ABOUT 6000FT & 160KTS. THE NR 2 ENGINE AUTOFEATHERED 3 TIMES WITH TORQUE AT 1200, GEAR DOWN AND PROPS 1700 RPM. MAINTENANCE PERFORMED AN OPERATIONAL RUNUP OF THE LEFT AND RIGHT ENGINES AND PERFORMED A TEST OF AUTOFEATHER SYSTEM IAW 1900D MM 61-21-00. ALL CHECKS GOOD, COULD NOT DUPLICATE FAULT.