As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED & ACFT WAS GNDED. FLIGHT CREW REPORTED A BURNING RUBBER SMELL FROM ROW 23 THROUGH AIR VENTS, PROGRESSIVELY GETTING STRONGER. THE FLIGHT CREW DECLARED AN EMER & DIVERTED WHERE THE ACFT LANDED SAFELY. ACCOMPLISHED CABIN AIR QUALITY CARD 26L00021001 & ECS DECONTAMINATION 26L00021004, VERIFIED NO ODORS NOTED THROUGHOUT CABIN & FLIGHT DECK. RETURNED THE ACFT BACK TO SERVICE.