What was found
AIRCRAFT GROUNDED, ON GEAR EXTENSION, NOSE AND LEFT GEAR TAKE 4-5 SECONDS LONGER THAN THE RIGHT GEAR TO EXTEND. ALSO LOUD "CLUNK" FROM NOSE WHEEL ON EXTENSION. TROUBLESHOOTING DETERMINED NOSE AND LEFT MAIN GEAR OPERATE NORMALLY, RIGHT MAIN GEAR WAS SLAMMING DOWN AND UP HARD. REPLACED RETRACT ACTUATOR ON RIGHT MAIN LANGING GEAR PER AMM 32-31-46, OPERATIONAL CHECK NORMAL, NO LEAKS NOTED.