As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, THE AFT GALLEY ODOR WAS REPORTED BY THE FLIGHT ATTENDANTS, EYES BURNING, LIGHT HEADED. AIRCRAFT RETURN TO GATE. IAW TSM 05-50-00-810-831-A AND TSI 0077569 SOF EVENT GALLEY LAVATORY EXTRACT FAN WAS REPLACED AS A PRECAUTION. REPLACED THE AFT GALLEY CHILLER IAW AMM 25-34-51.