As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAD/JFK - FLT 6193 - DURING TAXI AT 0730 HOURS ON 6-29-98, AIRCRAFT RETURNED TO GATE DUE TO SMOKE IN COCKPIT. MAINTENANCE INSPECTED AND FOUND LOOSE DUCT AT ROW 1A AND 2A GIVING OFF WATER CONDENSATION. MAINTENANCE RESECURED DUCT. OPS CHECK OK. AIRCRAFT WAS RELEASED AND RETURNED TO SERVICE. (X)