As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RIGHT HAND PROPELLER OVERSPEED TEST FAILED WHEN SELECTED, DURING TAXI CHECKS. THE AIRCRAFT RETURNED TO THE GATE. OUTSTATION MAINTENANCE INSPECTED, CLEANED AND SECURED THE RIGHT HAND OVERSPEED GOVERNOR CANNON PLUG. OPERATIONAL CHECKS WERE COMPLETED IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 71-01-00-820.