As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOR FLIGHT 4093 THE CREW REPORTED FUMES IN COCKPIT AFTER ENGINE 1 START COMPLIED WITH AOM PROCEDURES. THE AIRCRAFT RETURNED TO GATE. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED ENGINE ODOR EVENT TROUBLESHOOTING IAW ETN: ETN-EM-72-034. COULD NOT DUPLICATE AT THIS TIME. THE OPERATIONAL CHECK WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.