As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LEFT HAND PROPELLER OVERSPEED TEST FAILED TO OPERATE WHEN SELECTED ON THE TAXI PRIOR TO TAKEOFF. MAINTENANCE INSPECTED AND CLEANED THE LEFT HAND PROPELLER OVERSPEED GOVERNOR CANNON PLUG. OPERATIONAL CHECKS WERE COMPLETED, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 71-01-00, AND THE AIRCRAFT WAS RELEASED FROM MAINTENANCE.