As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 654 - ON CLIMB-OUT FROM DTW, NOSE GEAR DOORS WOULD NOT CLOSE. CREW ATTEMPTED TO RECYCLE GEAR FOUR TIMES UNSUCCESSFULLY. AIRCRAFT RETURNED TO DTW. AIRCRAFT WAS MAINTENANCE FERRIED TO PIT. MAINTENANCE ADJUSTED PROXIMITY SENSORS AND REPLACED THE LANDING GEAR SELECTOR VALVE.