As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMF- ON DESCENT INTO SMF, THERE WAS A HOT PLASTIC SMELL IN THE CABIN AND THOUGH AIR VENTS IN COCKPIT. SMELL DISSIPATED AFTER 5 MINUTES. INSPECTED AIR VENTILATION AND AVIONICS COOLING. NO PARTS REPLACED. NO DISCREPANCIES NOTED. AIRCRAFT RETURNED TO SERVICE.