As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING AN OVERSPEED SHUT-DOWN CHECK ON THE RIGHT ENGINE, THE ENGINE FAILED TO SHUT DOWN WHEN THE OVERSPEED TEST SWITCH WAS THROWN. UPON INITIAL INVESTIGATION, FOUND THE RIGHT ENGINE OVERSPEED ANNUNCIATOR WAS ON, BUT WOULD NOT RESET UNTIL THE SHUT-OFF VALVE WAS TAPPED. THE SHUT-OFF VALVE WAS REPLACED, BUT DID NOT CURE THE ORIGINAL PROBLEM. (THAT WAS TRACED TO THE CONTROLLER).