As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MECHANIC REPORTED THE M/R TRANSMISSION INPUT SHAFT ADAPTER RETAIING NUT SEEMED TO BE OVERTORQUED ON INSTALL OR PREVIOUS MAINTENANCE. ESTIMATED TORQUE WAS AT LEAST TWICE THE BHT M.M. SPEC FOR THAT PART. ADAPTER AND NUT MAGNAFLUXED FOR DEFECTS, NONE FOUND. SUBMITTER RECOMMENDED SAME ACTION IF OTHER OPERATORS ENCOUNTED THIS PROBLEM. (X)