What was found
DAY - FLT 4193 - ON DESCENT, WITH AUTO PILOT ENGAGED RECEIVED BACKUP PITCH TRIM INOPERATIVE MSG FOLLOWED BY ANOTHER RED MSG THE CREW COULDN’T READ. CAPT FELT A SMALL VIBRATION IN THE YOKE, VIBRATION ASSOCIATED WITH AUTO PILOT. ISSUED MEL 22-01, COMPLIED WITH EO EM-53MR-696. OPS CHECK GOOD. RETURN AIRCRAFT TO SERVICE. (M)