As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3565 - RETURNED TO THE GATE DUE TO ODOR & HAZE IN THE FLIGHT COMPARTMENT AND CABIN FROM THE ENGINE BLEEDS. MAINTENANCE INSPECTED AND TROUBLESHOT AIRCONDITIONING SYSTEM AND FOUND THE NR 1 ENGINE BLEED SYSTEM AT FAULT. THE ENGINE WAS REMOVED AND REPLACED, OPERATIONALLY CHECKED GOOD. AIRCRAFT WAS RETURNED TO SERVICE.