As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH AT 500 LBS TORQUE, WHILE LEVELING ALTITUDE AND ADVANCING POWER THE R/H ENGINE ATTEMPTED FEATHER CAUSING CYCLES SIMILAR TO AUTOFEATHER TEST. MAINTENANCE REMOVED AND REPLACED THE RIGHT HAND AUTOFEATHER LOW PRESSURE SWITCH AND COMPLIED WITH FCD 1900-09-61-01 & FCD 1900-08-61-01. PERFORMED GROUND RUNS AND PERFORMED AUTOFEATHER TEST IAW MM 61-20-00. OPERATIONAL CHECK WAS GOOD.