As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW STATES START SELECTOR RETURNED TO NORMAL POSITION RIGHT AFTER SELECTED TO START. TRIED MANUAL START WITH SAME RESULT. FOUND STARTER DRIVE COUPLING SHEARED. REPLACED STARTER. ALSO CHECK GEARBOX CHIP DETECTORS, ALL CLEAR, DRY MOTORED. ALL OPS OKAY.