What was found
WHILE SITTING AT THE GATE, WITH APU RUNNING AND PACKS ON. CABIN AND COCKPIT FILLED WITH SMOKE. REMOVED AND REPLACED THE LEFT ACM IAW AMM 21-51-08 OPS AND LEAK CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE SITTING AT THE GATE, WITH APU RUNNING AND PACKS ON. CABIN AND COCKPIT FILLED WITH SMOKE. REMOVED AND REPLACED THE LEFT ACM IAW AMM 21-51-08 OPS AND LEAK CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.