What was found
AFTER TAKEOFF NOSE GEAR DID NOT RETRACT. HAD 2 RED LIGHTS AND COULD HERE THE AIRFLOW NOISE FROM THE DOWN NOSE GEAR. DID WRY AND GOT 4 GREEN DOWN. RETURNED TO TPA AND DID NOT DECLARE AN EMERGENCY BECAUSE AFTER THE GEAR WAS DOWN ALL WAS NORMAL. DE-SERVICED AND REMOVED NLG STRUT PISTON. REMOVED NLG STRUT ORIFICE TUBE NUT AND REMOVED DIAPHRAGM TUBE REF MD-11 32-21-01-8. STILL REQUIRES STRUT SEAL INSTALLATIONS. REMOVED AND REPLACED BENT PUSHROD ON GROUND SENSING BRACKET.