What was found
AFTER TAKEOFF WITH GEAR SELECTED TO RETRACT, RECEIVED NOSE GEAR DISAGREE WITH A NOSE GEAR DOOR OPEN WARNING. ALL THREE GEAR INDICATED GREEN. MAX SPEED WAS 200KIAS CREW FOLLOWED QRH & RETURNED TO CVG. ATC DECLARED AN EMERGENCY. CREW LANDED & TAXIED SAFELY TO THE GATE. DURING CREW DEBRIEF CAPTAIN STATED THAT ON TOUCHDOWN THE ACFT WANTED TO VEER TO THE RT, BUT SHORTLY AFTER ROLL OUT STEERING CENTERED & WORKED NORMALLY. R & R NLG LOWER SHOCK STRUT IAW AMM 32-21-25. EXTENSION & RETRACTION OPERATIONS CHECKED GOOD AT THIS TIME.