As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON ASSEMBLY OF GEARBOX WHEN INSTALLING COUPLING , FOUND COUPLING WOULD NOT SIT COMPLETELY, STAYED COCKED. REMOVED COUPLING AND INSPECTED. FOUND IMPROPER MACHINING OF COUPLING MATING SURFACE TO F/C GEAR WITH PIECES OF ROLLED METAL. FUEL CONTROL GEAR HAD IMPROPER MACHINING AT COUPLING MATING SURFACE. (X)