As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT AFTER GEAR RETRACTION, A LOUD NOISE WAS HEARD IN THE FRONT NOSE AREA OF THE AIRCRAFT. NOSE GEAR GREEN AND RED LIGHTS ILLUMINATED WHEN GEAR HANDLE WAS PLACED IN THE 'OFF' POSITION. RETURNED TO DTW AND LANDED WITHOUT INCIDENT. REPLACED THE FORWARD LOWER PULLEY ASSEMBLY QUADRANT AND PERFORMED GEAR SWING.