As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PROP STUCK AT 1570 RPM IN FLIGHT - EMERGENCY DECLARED - TROUBLESHOOTING ISOLATED TO PROPELLER PRIMARY GOVERNOR. REMOVED LEFT ENG PROP GOVERNOR P/N 8210-310 S/N 20572154, INSTALLED REPAIRED GOVERNOR P/N 8210-310 S/N 11509197 PER P&WC PT6A-60A EMM CHAPT 61- 20-00 AND FIND NORMAL OPS CHECK PER KING AIR B300 FUS AMM CHAPT 76-10-15.