What was found
ATL - FLT 19 - ATL-PHX - AFTER NR 1 ENGINE START, GROUND CREW NOTICED LARGE HYDRAULIC LEAK ASSOCIATED WITH YELLOW HYDRAULIC LOW LEVEL. LEAK NOTED AT YELLOW HYDRAULIC RESERVOIR DOOR. AIRCRAFT RETURNED TO GATE WITHOUT FURTHER PROBLEMS. CONTRACT MAINTENANCE REPLACED GROUND SERVICE MANIFOLD, REF MM 29-19-41, PAGES 427/437. NO LEAKS NOTED UNDER PRESSURE. SYSTEM SERVICED TO FULL. AIRCRAFT RETURNED TO SERVICE. (Z)