As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF WITH AIR CONDITIONING FAN ON AND DEMIST 1 TURN OPEN COCKPIT HAD BURNING SMELL AND SMOKE HAZE. AIRCRAFT RETURNED TO DEPARTURE LOCATION WITHOUT INCIDENT. INSPECTED HEAT AND DEMIST DIFFUSERS FOR DEBRIS WITH NONE FOUND. HEAT AND DEMIST VALVES OPERATE NORMAL WITH NO LEAKS UNDER BELLY. SUSPECT P2 AIR FLEX LINE FROM ENGINE. REMOVED AND REPLACED P2 LINE PN 704A34-402-308. RAN ENGINE WITH DEMIST AND HEAT ON WITH NO CONTINUATION OF SMOKE SMELL OR HAZE.