As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION OF INPUT QUILL ASSY REVEALED THAT INCORRECT SHIMMING PROCEDURE RESULTED IN CAP ASSY AND PINION HAVING TO BE REPLACED. INSTALLED NEW CAP, BEARINGS, SEALANT PACKINGS. PINION THAT WAS REMOVED WAS SENT TO ABLE METALLICS FOR REPLATING DUE TO COPPER PLATING DAMAGE.