As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING NORMAL SHUTDOWN A FADEC DEGRADE LIGHT AS THE THROTTLE WAS PLACED TO OFF. THE MECHANIC ARRIVED & VERIFIED OVERSPEED TEST 4 & 5 FAIL & AN OVERSPEED FAIL. VERIFIED ALL CONNECTORS TO BE CLEAN & SECURE IAW RR 250 C47B MM CHPT 73-25-01 FAULT ISOLATION MANUAL. THE FAULTS WERE THEN CLEARED. PERFORMED A GND RUN WITH NO DISCREPANCIES NOTED. THE ACFT WAS RETURNED TO SERVICE AT THAT TIME.