As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PIC REPORTED A SMOKE SMELL AND SAW SMOKE IN THE COCKPIT. DECLARED AN EMERGENCY AND DID AN AIR TURNBACK AND LANDED SAFELY. TAXIED CLEAR OF THE RUNWAY AND WAS MET BY EMERGENCY RESPONDERS. THE AIRCRAFT WAS SHUT DOWN AND TOWED TO THE RAMP. TROUBLESHOOTING IS NOW IN PROGRESS.