What was found
LEFT HYDRAULIC PRIMARY PUMP APPEARS INOP. AIRCRAFT RETURNED TO GATE AND WAS GROUNDED BY MAINTENANCE. MAINTENANCE REPLACED LEFT ACMP, LEFT ACMP PRESS/CASE DRAIN FILTER MODULE AND LEFT EDP PRESSURE/CASE DRAIN FILTER MODULE IAW B767 AMM 29-11-01, 29-11-17 AND 29-11-18, PRESS AND TEMP NORMAL, LEAK CK OK.AIRCRAFT RETURNED TO SERVICE.