What was found
HAV - FLT 620 - DURING PUSH BACK, OF FLIGHT AT HAVANA STATION, THE CAPTAIN REPORTED, ON GROUND WITH ENGINES SHUTDOWN, ENGINE NR 2 HYDRAULIC YELLOW AND ELECTRICAL BLUE PUMPS FAULT LIGHT CAME ON AND OFF, ALSO EPR AND EGT NR 2 CAME ON AND OFF CONSTANTLY. LANDING GEAR SYSTEM DISAGREE. THE AIRCRAFT RETURNED TO THE GATE FOR MAINTENANCE. TECNICIANS AT HAVANA STATION REMOVED AND REPLACED NR 2 LGCIU PERFORMED OPERATIONAL TEST PER MM 32-31-71, WITH SATISFACTORY RESULTS. NO OTHER FAULTS WERE DETECTED. THE AIRCRAFT RETURNED TO NORMAL OPERATION. (M)