As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, ALL CREW MEMBERS OBSERVED A BURNING ODOR. CABIN EMERGENCY LIGHTING CIRCUIT BREAKER TRIPPED. RETURNED TO DTW AND LANDED UNEVENTFULLY. REPLACED EMERGENCY LIGHT POWER SUPPLY AND TESTED OK. CHECKED WIRING FOR DAMAGE AND FOUND OK. AIRCRAFT RETURNED TO SERVICE.