What was found
PARAMEDIC ADVISED STRANGE BURNING ODOR WITH FUMES AND POSSIBLE SMOKE IN CABIN. TURNED OFF THE AIR CONDITIONER AND VENTED THE COCKPIT AND CABIN WHICH REMEDIED THE SITUATION. FOUND PRESSURE SWITCH BLOWN APART IN PIECES, RELEASING ALL OF THE FREON FROM THE SYSTEM. THE RESULTING FREON OIL MIXTURE WOULD EXPLAIN THE SMELL AND HAZE REPORTED IN THE AFT CABIN. SYSTEM WAS DEACTIVATED, SECURED, AND DEFERRED UNDER THE MEL UNTIL PARTS AND TOOLS FOR REPAIR ARE RECEIVED.