What was found
ELECTRICAL BURNING SMELL IN BACK MID WAY THRU CABIN, NO SMOKE (FLIGHT 4055). TROUBLESHOT "ELECTRICAL BURNING SMELL IN BACK MID WAY THRU CABIN, NO SMOKE" IN REF TO CRJ 900 FIM 21-22-00. FOUND SIDEWALL LIGHT BALLAST AT SEAT 9AB TO HAVE A BURNT RESISTOR CAUSING IT TO SMELL LIKE ELECTRICAL BURNING. REMOVED AND REPLACED SIDEWALL LIGHT BALLAST AND CEILING LIGHT BALLAST AT SEAT 9AB IN REF TO CRJ 900 AMM 33-21-03. ALSO REMOVED AND REPLACED SIDE WALL LIGHTS AT SEAT 9A/B IN REF O CRJ 900 AMM 33-21-07. OPS CHECK GOOD AT THIS TIME NO BURNING SMELL NOTED. NO FUTHER DAMAGE TO ANY OTHER COMPONENTS NOTED AT THIS TIME