As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) UPON INSTALLING THE COUPLING ASSEMBLY INTO THE GEAR CASE OF ENGINE P-54214, IT WAS NOTICED THAT THE NTS TRIP PRESSURE COULD NOT BE SET UP. FURTHER INVESTIGATION REVEALED THAT THE INTERNAL SPLINE THAT COUPLES THE QUILL SHAFT TO THE COUPLING ASSY WAS TURNING INSIDE, THUS THE NTS PRESSURE COULD NOT BE SET UP. THE COUPLIG ASSY WAS PART OF NEW PART WITH 0 HOURS AND 0 CYCLES.