As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, FLIGHT ATTENDANT REPORTED AN ELECTRICAL ODOR IN THE CEILING AREA BETWEEN AFT LAVATORIES. LASTED 5 MINUTES AND THEN GONE. FOUND CEILING LIGHT BALLAST TO BE SOURCE OF ODOR. REPLACED THE LIGHT BALLAST IAW AMM 33-21-00. AIRCRAFT WAS GROUNDED.