As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, AN ELECTRICAL ODOR AND SMOKE WAS NOTICED COMING FROM THE OVERHEAD LIGHTS IN CABIN ZONE 'B'. TURNED CABIN LIGHTS OFF AND THE ODOR AND SMOKE DISSIPATED. AIRCRAFT CONTINUED TO DTW AND LANDED WITHOUT INCIDNET. REPLACED BALLAST AT ROW 12JK. OPERATIONAL CHECK GOOD.