What was found
AFTER TAKEOFF WHEN GEAR RETRACTED RIGHT MAIN REMAINED RED ON PRIMARY AND SECONDARY. EMERGENCY DECLARED. FLT CREW VERBAL REPORTED A/C LITTLE VIBLATION AFTER GEAR UP. R/H MAIN GEAR GVI CHECKED NO DEFECT FOUND. RT MAIN GEAR PROXIMITY SENSOR WORK NORMAL. NEED TO GEAR WING CHECK BUT WING AND FUSELAGE JACK ADAPTER NIS IN ICN, REQUESTED TOOL TO NRT. REMOVED AND REPLACED RT MAIN LANDING GEAR RETRACT CYLINDER AND PERFORMED LEAKAGE CHECK AND OPERATION TEST NORMAL IAW AMM32-33-20-4.