As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF FROM DTW THE NOSE GEAR WOULD NOT RETRACT. PILOTS COORDINATED A LOW PASS "TOWER FLY BY" FOR ADDITIONAL VISUAL VERIFICATION OF THE LANDING GEAR. AN UNEVENTFUL LANDING BACK IN DTW AFTER 1 HOUR OF BURNING FUEL. LANDING BACK IN DTW WAS UNEVENTFUL, THE AIRCRAFT WAS WRITTEN UP AND TURNED OVER TO DTW MTX. DTW MTX SERVICED THE GEAR AND ADJUSTED THE NLG CENTERED / EXTEND PROX SWITCH AND PERFORMED GEAR SWINGS.