What was found
BLEED AIR SMOKE IN CABIN AND COCKPIT COULD NOT ISOLATE TROUBLE. RETURNED TO FIELD WITHOUT INCIDENT. ISOLATED TO NR 2 BLEED. REMOVED AND REPLACED COOLING TURBINE, OPERATIONAL CHECKS GOOD.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
BLEED AIR SMOKE IN CABIN AND COCKPIT COULD NOT ISOLATE TROUBLE. RETURNED TO FIELD WITHOUT INCIDENT. ISOLATED TO NR 2 BLEED. REMOVED AND REPLACED COOLING TURBINE, OPERATIONAL CHECKS GOOD.