As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER THE GEAR WAS SELECTED UP, BOTH THE HYDRAULIC LIGHTS CAME ON THE CENTRAL WARNING PANEL. THE GEAR WAS SELECTED DOWN. THREE RED WAS SHOWN ON THE GEAR INDICATION. AN EMERGENCY WAS DECLARED. THE EMERGENCY GEAR HANDLE WAS PULLED PER THE CHECK LIST. THE CREW MADE A 45 DEGREE BANK AND HEARD THE GEAR LOCK. THE AIRCRAFT WAS LANDED AT DTW ON 21L WITHOUT INCIDENT. THE GEAR WAS PINNED AND TOWED OFF THE RUNWAY BACK TO RAMP.