As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER SELECTING BLEED AIR ON THE FLOW OF BLEED AIR TO THE COCKPIT WAS ABNORMALLY HIGH FOLLOWED BY ILLUMINATION OF THE AIR DUCT O'HEAT, CKPT ANNUNCIATOR AND THE COCKPIT BEGAN TO FILL WITH SMOKE. ABNORMAL CHECKLIST COMPLETED. REPLACED ECU TEMP CONTROL VALVE IAW C-560XL M/M CH 21-51-00. GROUND OPS CK OF SYSTEM OK.