As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE LOG PAGES 492755 AND 492756. FLIGHT CREW MADE AN AIR RETURN DUE TO A BURNING ODOR IN THE AFT GALLEY. MX PERFORMED TROUBLESHOOTING IAW TSM 21-00-00-810-802, TSM 24-00-00-810-823 AND SIL 21-135. MX DETERMINED THE AFT GALLEY COFFEEMAKERS WERE CAUSING THE BURNING ODOR WHEN BREWING. MX REMOVED AND REPLACED BOTH AFT GALLEY COFFEEMAKERS IAW AMM 25-35-15 PB 401 AND PERFORMED SATISFACTORY OPS CHECK. THE ACFT WAS RETURNED TO SERVICE.