What was found
ON DESCENT FA'S REPORTED THAT THE CABIN LIGHT BECAME UNCONTROLLABLE. WHEN THE CABIN LIGHT SWITCH WAS OFF, THE LIGHTS WOULD COME ON AND VICE-VERSA. THEN THE CABIN BEGAN TO SMELL OF ELECTRICAL SMOKE, BUT NONE COULD BE SEEN. SMELL CAME FROM OVERHEAD BIN 17A/B. FLIGHT 3644-FILED CLOSED. TROUBLESHOT UNCONTROLLABLE CABIN LIGHTS, PER ERJ FIM TASK. FOUND BALLAST AT 16 A/B TO BE FAILING AND HAVE A BURNED SMELL. REMOVED AND REPLACED DC BALLAST FOR CELING LIGHTS ABOVE SEAT 16A/B, PER ERJ AMM. OPERATIONS CHECK GOOD. A/C OK FOR SERVICE. VERIFIED DC BALLAST AND FOUND CIRCUIT BOARD TO BE BURNED.