What was found
IN CRUISE FLIGHT, THE AUTO TEMPERATURE WAS NOT WORKING. CREW WENT TO MANUAL TO COOL THE CABIN AND THE CABIN ALTITUDE CLIMBED TO 10,000 FT. AN EMERGENCY WAS DECLARED, DESCENDED TO 25,000 FT, AND MADE AN UNEVENTFUL LANDING AT CLT. MSP MAINTENANCE FOUND A DUCT OFF THE INLET TO THE RIGHT PACK WATER SEPARATOR AND RESECURED IT. OPERATIONAL CHECK OK. AIRCRAFT OK FOR SERVICE.