What was found
ENGINE 1 HYD PUMP, A SYS, LOW PSI LIGHT CAME ON IN FLIGHT. ACFT GROUNDED. AIR TURNBACK - FOUND NR 1 ENGINE HYDRAULIC PUMP PRESSURE LINE LEAKING AT THE FIREWALL DISCONNECT. R & R NR 1 ENGINE PRESSURE HOSE ASSY AS DEPICTED IN IPC 29-11-51-01A ITEM NR 40. R & R NR 1 ENG HYD PUMP IAW AMM 29-11-11-400-801 S01, PERFORMED HYD SYS A FLUSHING IAW AMM 29-11-00-170-801. R & R A SYS PRESSURE FILTER IAW AMM 29-11-71-000-802 AND 29-11-71-400-802. NO CONTAMINATION NOTED. R & R NR 1 ENGINE CASE DRAIN FILTER IAW AMM 29-11-51-000-801 AND 29-11-51-400-801, NO CONTAMINATION NOTED, R & R A SYSTEM RETURN FILTER IAW AMM 29-11-61-000-801 AND 29-11-61-400-801, NO CONTAMINATION NOTED. BLED HYDRAULIC SYSTEM IAW AMM 29-00-00-870-801. LEAK CHECK IAW AMM 29-00-00-790-801, OK. SERVICED RESERVOIR IAW AMM 12-12-00-610-801, 2 GALLONS ADDED PERFORMED 2ND REPLACEMENT OF EDP CASE DRAIN, A SYS PRESSURE & A SYS RETURN FILTERS PER ABOVE PROCEDURES, NO CONTAMINATION NOTED BLEED AND LEAK CHECKS PERFORMED IAW ABOVE PROCEDURES, CHECKS OK.