What was found
ON THE GROUND AND DURING TAKE OFFS AND LANDINGS THE ELEVATOR FEEL ON PULLING AND PUSHING THE CONTROL WHEEL YOKE WAS UNUSUALLY LIGHT AND MUSHY. WE NEVER GOT A FEEL DIFF PRESS LIGHT. ALL HYDRAULIC PRESSURES AND QUANTITIES INDICATED NORMAL. GROUNDED - YES. FOUND FEEL & CENTERING SPRING BROKEN. REMOVED AND REPLACED ELEVATOR FEEL AND CENTERING UNIT REF B737-900 AMM 27-31-64/401.-000-801. INSTALLATION TEST (FEEL FORCE SYSTEM TEST) PASS REF AMM 27-31-00-700-812.