What was found
IMMEDIATELY AFTER TAKEOFF WHEN GEAR LEVER HANDLE PLACED IN "UP" POSITION RECEIVED EICAS MESSAGES "LG LEVER DISAGREE "HYD SYS 1 FAIL" HYD SYS 1 INOP" HYD 1 LOW QTY" E1 HYD PUMP FAIL. DECLARED AN EMERGENCY AFTER A FLYBY CREW LANDED UNEVENTFULLY. REMOVED AND REPLACED RIGHT MAIN LANDING GEAR ACTUATOR UP HYDRALIC HOSE P/N 145-70242-401. REPLACED NR 1 EMDP P/N MPEV30086 S/N MS684677. REPLACED E1 HYD PUMP P/N 971808 MOD D S/N MX611193. REPLACED 3 HYD FILTERS P/N 31829-3. AIRCRAFT RETURNED TO SERVICE.