As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BEFORE TAKEOFF, PROPELLER OVERSPEED TESTED FAILED. AIRCRAFT RETURNED TO THE GATE. MAINTENANCE INSPECTED AND FOUND PROPELLER OVERSPEED GOVERNOR CANNON PLUG DIRTY. CLEANED CANNON PLUG. OPERATIONAL TEST CHECKED GOOD AND AIRCRAFT WAS APPROVED TO RETURN TO SERVICE.