What was found
#1 ENGINE LEAKING FUEL FROM THE BOTTOM. REMOVED FROM SERVICE. OPENED #1 ENG. FAN COWL IAW AMM 71-11-00-910-801-A PERFORMED GVI OF ENGINE W/ NO LEAKS NOTED, CLOSED FAN COWL IAW AMM TASK 71-11-00-910-802-A. PERFORMED #1 ENG RUN W/ CREW FOR 5 MIN, LARGE FUEL LEAK NOTED FROM #1 ENG DRAIN MAST. VERIFIED FUEL LEAKING DRAIN #3 (CORE DRAIN) AT 25 DPM STATIC, 11-06-21, FAN REV COWL OPEN TO FOM, FOUND FUEL PUMP LEAKING, CLOSED AND SECURED #1 ENG FAN AND REV COWL IAW AMM 71-11-00-910-801-A, 71-11-00-910-802-A, AMM 78-30-01-910-801-A, 78-30-01-910-802-A. REMOVED AND REPLACED #1 ENGINE FUEL PUMP, REF. E175 AMM 73-11-01-000/400-801-A. OPS CHECK PASSED, NO LEAKS FOUND. A/C OK FOR SERVICE. AIRCRAFT RETURNED TO SERVICE.