As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF OF FLIGHT 3075, LANDING GEAR UNSAFE INDICATOR WOULD NOT EXTINGUISH AFTER A NORMAL TIME PERIOD AFTER T/O. LIGHT REMAINED ON WITH HYDRAULIC PUMP RUNNING CONSTANTLY UNTIL GEAR WAS SELECTED BACK DOWN. GEAR GOT 3 GREEN DOWN AND NORMAL LANDING ACCOMPLISHED. AIR RETURN TO DTW. MAINTENANCE CLEANED ICE AND SLUSH BUILD UP OFF ALL THREE GEAR LEGS. ALL CHECKS GOOD AT THIS TIME.