As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COUPLING WAS FOUND CRACKED IN 7 PLACES. IT WAS LOCATED AT THE INTERMEDIATE GEARBOX OUTPUT FLANGE. THE PREVIOUS COUPLING WAS ALSO CRACKED. THE RUN-OUT WAS CHECKED AND FOUND WITHIN MANUFACTURER'S LIMITS. THE NR 5 T/R DRIVESHAFT AND INTERMEDIATE GEARBOX WERE REMOVED FOR FURTHER EVALUATION. NEW COUPLING WAS INSTALLED. RUN-OUT CHECK IS WITHIN MANUFACTURER'S LIMITS.