What was found
LAS - BURNING ODOR - FLT 0747 - EN ROUTE FROM CHM TO LAS AT 10,000 FT A BURNING ELECTRICAL ODOR WAS OBSERVED IN THE COCKPIT AND FORWARD CABIN, SMELL DISSIPATED AFTER APPROXIMATELY 1 MINUTE. MAINTENANCE FOUND A DEFECTIVE CEILING LIGHT BALLAST AT SEAT ROW 1 LT, REPLACED LIGHT BALLAST SEAT ROW 1 LT, OPERATIONAL CHECK OF CABIN LIGHTING WAS GOOD.