As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AND BURNING ELECTRICAL SMELL ORIGINATING FROM OVERHEAD BIN AREA AROUND ROW 29 TO REAR OF CABIN. MAINTENANCE FOUND FORWARD BALLAST ROW 27ABC FOR LOWER SIDEWALL LIGHTS TO BE INOPERATIVE. BALLASTS WERE REPLACED AT ROW 24ABC AND 27ABC. OPERATED CABIN LIGHTS WITH SEVERAL POWER CHANGES AND ALL CHECKS WERE GOOD. NO FURTHER TROUBLE, SMOKE, OR SMELL.