As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OVEN 606 GENERATED HEAVY BLACK SMOKE WHEN OPERATING. REMOVED TRAYS FROM OVEN & CLEARED DEBRIS FROM BOTTOM AND BACK TO PERFORM OPS TEST IAW AMM 25-32-02-200-802-001. WHITE SMOKE CAME OUT WITHIN ONE MINUTE OF STARTING WARMING CYCLE. REMOVED AND REPLACED THE OVEN. OPS CHKD GOOD IAW AMM 25-32-02.