What was found
AFTER AUTOPILOT WAS ENGAGED, ACFT PITCHED DOWN. AUTOPILOT WAS MANUALLY DISCONNECTED. MOMENTARY FEEL DIFF PRESS LIGHT CAME ON. HYD SYS QTY SLOWLY DROPPED TO ZERO FOLLOWED BY A TOTAL LOSS OF HYD SYS A PRESS. PERFORMED FIM TASK 29-30-00-810-803 FOR FLUID & PRESS LOSS. FOUND FAILED COMPENSATOR CARTRIDGE ON A SYS FLIGHT CONTROL HYD MODULE. R & R SAME IAW AMM 27-09-21-000-801. ALSO R & R A SYS HYD SYS RETURN FILTER IAW AMM 29-11-61, PRECAUTIONARY. A SYS ELEC & ENG DRIVEN HYD PUMPS PRESS CHECKED GOOD.