As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT HYDRAULIC SYSTEM QUANTITY WENT TO ZERO AFTER TAKEOFF. CREW DECLARED AN EMERGENCY AND FLIGHT WAS RETURNED TO DTW. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND LEFT HYDRAULIC SYSTEM TOP BRAKE FUSE ON INBOARD SIDE BROKEN OFF. REPLACED FUSE. ALSO REPLACED ENGINE DRIVEN HYDRAULIC PUMP. LEAK AND OPERATIONAL CHECK NORMAL.