What was found
(CAN) SHORTLY AFTER LANDING GEAR RETRACTION, LOUD BANG HEARD ACCOMPANIED WITH VIBRATION AND RIGHT GEAR UNSAFE LIGHT ILLUMINATED WITH LOSS OF RIGHT HYDRAULIC QUANTITY. MAINTENANCE CHECK FOUND RIGHT MAIN GEAR RETRACT ACTUATOR SPLIT AND AUXILIARY HYDRAULIC PUMP LEAKING. MAINTENANCE ACTION INVOLVED CHANGING RIGHT GEAR RETRACT ACTUATOR, CHECKING AND CHANGING ALL HYDRAULIC FILTERS. ALSO AUXILIARY HYDRAULIC PUMP AND BUNGEE CYLINDER REPLACED. GEAR OPERATIONALLY CHECKED.