As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7537 - DRO-DEN - CRWE REPORTED, THAT IN FLIGHT WITH LEFT BLEED AIR ON HAD SMOKE IN COCKPIT. AIRCRAFT WAS INSPECTED AND RUNUP WAS PERFORMED IN DEN. NO DISCREPANCIES WERE NOTED AND THE PROBLEM COULD NOT BE DUPLICATED. DE-ICE FLUID WAS SUSPECTED TO HAVE CAUSED THE PROBLEM. AIRCRAFT WAS RETURNED TO SERVICE (M)