As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT AND ON SHORT FINAL, THE AUTOFEATHER SYSTEM WAS ATTEMPTING AN UNCOMMANDED FEATHER. PERFORMED ENGINE GROUND RUNS AND NOTED RT ENGINE LAGS IN THE AUTOFEATHER RANGE. R & R RT ENGINE FCU IAW EMM CH: 73-20-00. PERFORMED STATIC RIGGING, OPS, LEAKS AND FINAL RIGGING IAW AMM 71-00-00 & 76-10-00. OPS CHECK EDGOOD.