What was found
PASSENGER LIGHT OVER 1 A BEGAN FLICKERING AND SMOKE BEGAN TO COME OUT OF THE LIGHT AREA. (FLIGHT 4324)TROUBLESHOT SMOKE IN CABIN IAW FIM 21-22-00-810-806. PERFORMED OPS CHECK OF AC DISTRIBUTION SYSTEM IN REFERENCE TO AMM 21-51-00 PER FIM. NO SMOKE OR ABNORMAL SMELLS NOTED. FOUND SIDEWALL LIGHT OVER 1A TO BE INOP. DROPPED PANEL WITH LIGHT POWER UNITS/DIMMERS OVER SEAT 1A IN OVERHEAD BIN AND FOUND ONE TO BE AN OBVIOUS CAUSE OF THE LIGHT FLICKERING AND SMOKE. FOUND POWER UNIT/DIMMER HAS EXTERNAL EVIDENCE OF BURNING AND INTERNAL HARDWARE MELTED/BURNT CAN BE SEEN THROUGH COOLING HOLES. REMOVED AND REPLACED SIDEWALL LIGHTS POWER UNIT/DIMMER IN OVERHEAD BIN OVER SEAT 1A IN REFERENCE TO AMM 33-21-09. OPS CHECK GOOD. A/C OK FOR CONTINUED SERVICE.