As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT BOTH PILOTS NOTICED STRONG SMELL OF SOMETHING BURNING. BOTH FLIGHT NURSES SMELLED SMOKE. ONE SAID SHE SAW SMOKE COME FROM ABOVE HER HEAD. AIRCRAFT WAS TURNED TOWARD LAKE FRONT. LANDED IMMEDIATELY. AIRCRAFT HAD NO FAILURES OR WARNING LIGHTS. MAINTENANCE REPLACED THE AIR CONDITIONING EVAPORATOR BLOWER MOTOR ASSY.