As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, SMOKE DETECTORS IN THE AFT LAVATORIES ACTIVATED. FLT ATTENDANT NOTED HIGH PITCH NOISE IN GALLEY AND LIGHT ODOR. CHECKED OVENS, COFFEE MAKERS AND LIGHT BALLASTS, NO PROBLEMS NOTED. REPLACED BATTERIES IN SMOKE DETECTORS, RETURNED TO SERVICE.