As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2273. SULFUR OR SEWAGE SMELL COMING THROUGH CABIN GASPERS. CONFIRMED NO LAV CART IN AREA OF EXTERNAL AIR INTAKES. REMOVED FROM SERVICE. SMELL COMING FROM OUTSIDE SOURCE AFTER SOURCE REMOVED, SMELL DEPARTED. COULD NOT DUPLICATE. RETURNED TO SERVICE. NO PARTS REPLACED.