As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK, AFTER T/O THERE WAS A PUNGENT ELECTRICAL ODOR IN THE CABIN ACCOMPANIED BY FAILURE OF ELECTRIC STAB TRIM ON BOTH SIDES. ELECTRIC TRIM BEGAN WORKING AFTER LANDING. REMOVED AND REPLACED WATER SEPARATOR BAGS PER MM AND OPS CK'D STAB TRIM PER MM, NO DISCREPANCIES FOUND.