What was found
HYDRAULIC SYSTEM A WENT FROM 35% ON CLIMB OUT TO YELLOW DASHES, 0%, ON APPROACH AND LANDING. BOTH 1A AND 1B PUMPS WERE OPERATING DURING THE EVENT. (FLT 3130) FO: 02/28/2019 CLOSED REMOVED AND REPLACED LT ACMP, NR 1 PRESS MANIFOLD FILTER ELEMENT, RETURN MANIFOLD ELEMENT, NR 1 HYD DRAIN MANIFOLD FILER ELEMENTS IAW AMM. LEAK CHECK AND PRESSURE CHECK GOOD.