As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING OUT OF FL 220 RECEIVED A CALL FROM FORWARD FA INDICATING THERE WAS VISIBLE SMOKE IN THE CABIN. SMOKE WAS VISIBLE TO FLIGHT DECK CREW AT THIS POINT AND THE ODOR OF ELECTRICAL BURN WAS PRESENT. FOLLOWED QRH RETURNED TO FIELD AND DECLARED EMERGENCY. (FLT#3078) CLOSED REMOVED AND REPLACED CEILING LIGHT BALLAST AT ROW 8 A/B IAW AMM. OPS CHECK GOOD.