What was found
FLIGHT ATTENDANTS SMELLED SMOKE AROUND SEAT 17D, NO SIGNS OF SMOKE OR INDICATION IN CABIN NOR FLIGHT DECK. THE AIRCRAFT WAS GROUNDED. WHILE WORKING ON JC 26L00021001, FOUND AN INOPERATIVE BALLAST. MAINTENANCE ACCOMPLISHED JOBCARD 26L0021001 AND REPLACED BALLAST AT 17D, NO ODOR NOTED.