What was found
UPON SELECTION OF WING ANTI-ICE AFTER TAKEOFF, SMOKE BEGAN FILLING CABIN ALONG WITH RIGHT AIR CONDITIONING SUPPLY TEMPERATURE HIGH LIGHT ILLUMINATED. FORWARD LAVATORY SMOKE DETECTORS ALSO SOUNDED. CREW DECLARED AN EMERGENCY AND FLIGHT WAS RETUREND TO MBS. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED RIGHT AUGMENTATION VALVE WHICH WAS SUSPECTED TO BE FROZEN. ALSO, REPLACED RIGHT THERMOSTAT AND ANTICIPATOR. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.