What was found
ON TAKEOFF, NOSE LANDING GEAR SHOWED DISAGREE. NOSE GEAR APPEARED STUCK DOWN. FLIGHT RETURNED TO ORD, LANDING UNDER AMBER ALERT. *S/D* COULD NOT DUPLICATE MALFUNCTION ON GROUND. REPLACED THE NLG RETRACT ACTUATOR AND NLG LOCK ACTUATOR AS PRECAUTIONARY. SHOP FINDINGS FOUND NO FAULTS WITH ACTUATORS. REPLACED THE NLG SELECTOR BYPASS VALVE (99C55202-101), PERFORMED RIG CHECK OF THE NLG DOOR OPERATED SEQUENCE VALVE LINKAGE AS A FOLLOWUP AT A LATER DATE. THE NLG DOOR OPERATING SEQUENCE VALVE WAS FOUND SLIGHTLY OUT OF ADJUSTED. THIS WAS CORRECTED AND THE AIRCRAFT RETURNED TO SERVICE.