As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3235 THE CREW REPORTED THAT DURING TAXI IN THEY NOTICED FUMES IN THE COCKPIT AND CABIN. APU BLEED ON. THE AIRCRAFT WAS REMOVED FROM SERVICE. PERFORMED ENGINE RUN IAW RRMM 72-00-00 WITH BLEEDS AND PACKS ON. COULD NOT DUPLICATE PROBLEM AT THIS TIME. FUNCTIONAL CHECK FLIGHT FOUND SATISFACTORY, NO FUMES NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.