What was found
FL 350 INTERMITTENT LOW PRESS ON NR 1 ENG HYD PUMP & MASTER CAUTION TO DROP TO ZERO. GOOD PRESS 3000 PSI ON A SYS THROUGHOUT TOUCHDOWN. QTY BOUNCED TO 16 AFTER LANDING. FOUND ACOUSTIC FILTER HOUSING LEAKING FOR HYD A SYS. R & R HYD A ACOUSTIC FILTER ASSEMBLY IAW AMM 29-11-27. LEAK CHECKED GOOD. DURING OPERATIONS CHECK FOUND NR 1 ENG HYD PUMP NOT PRODUCING ENOUGH PRESS. R & R NR 1 ENG HYD PUMP IAW AMM 29-11-11. OPERATIONS & LEAK CHECKED GOOD. EMER DECLARED.