What was found
AIR RETURN FOR STAB TRIM (AND MACH TRIM) CAUTION AFTER TAKEOFF. RAN QRH W/O RESOLUTION. REMOVED AND REPLACED HSTCU IAW AMM 27-41-01. OP CHECK GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR RETURN FOR STAB TRIM (AND MACH TRIM) CAUTION AFTER TAKEOFF. RAN QRH W/O RESOLUTION. REMOVED AND REPLACED HSTCU IAW AMM 27-41-01. OP CHECK GOOD.