What was found
SEA- AS AIRCRAFT WAS LEVELING OFF IN CRUISE NOSE GEAR DOORS UNLOCKED. ASSOCIATED AMBER AND RED LIGHTS CAME ON. AFTER THREE SECONDS LIGHTS EXTINGUISHED AND GEAR APPEARED TO BE UP AND LOCKED. AIRCRAFT RETURNED TO SEA WITHOUT INCIDENT. INSPECTED RIGHT AND LEFT UPLOCK ACTUATORS FOR MAIN NOSE GEARS. LEFT UPLOCK HOOK ASSEMBLY HAS EXCESSIVE PLAY. INSTALLED SERVICEABLE LEFT UPLOCK ACTUATOR ASSEMBLY. NOSE LANDING GEAR PROXIMITY SWITCH RIGGING OK. PERFORMED GEAR SWINGS. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.