As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI FOR TAKEOFF,THE CREW ATTEMPTED A PROPELLER OVERSPEED WARNING TEST. THE TEST FAILED AND THE AIRCRAFT RETURNED TO THE GATE WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND TIGHTENED THE LEFT PROPELLER OVERSPEED GOVERNOR CANNON PLUG, IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 71-01-00. OPERATION CHECKS WERE SATISFACTORY.