As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED, DURING FLIGHT THERE WAS AN ELECTRICAL BURNING SMELL AROUND ROW 15. MAINTENANCE FOUND THE OVERHEAD LIGHT BALLAST AT ROW 15 TO BE INOPERATIVE. THE LIGHT WAS DISCONNECTED AND DEFERRED. THE DEFERRAL WAS CLEARED ON 3/23/2012 BY REPLACING THE LIGHT BALLAST AT ROW 15. OPERATIONAL CHECKS WERE GOOD WITH NO FURTHER DEFECTS NOTED.