As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRSHUTTLE 7546 - DEN-DRO - DURIN GTAXI THE CREW NOTICED AN ACRID SMELL IN THE PASSENGER CABIN, AIRCRAFT RETURNED TO THE GATE. LATER WHEN FAXING IN AN OCCURENCE REPORT THE CAPTAIN ALSO REPORTED SEEING SMOKING. MAINTENANCE RAN THE AIRCRAFT AND FOUND NO DISCREPANCIES. AIRCRAFT WAS RETURNED TO SERVICE. (M)