As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF OUT OF APA CREW TURNED ON NACELLE HEAT AND THE CABIN FILLED WITH SMOKE, RETURNED TO APA NO PROBLEMS. MAINTENANCE FOUND THE BLEED AIR CHECK VALVE AT THE HYD RESERVOIR FAILED. REMOVED AND REPLACED CHECK VALVE, OPS CHECKED GOOD.