What was found
IN LATE JAN 1999, IN FLIGHT, THE TEMPERATURE CONTROL CIRCUIT BREAKER OPENED. AS A RESULT THE CREW EXPERIENCED AN OVERTEMP CONDITION OF THE ENVIRONMENTAL SYSTEM. THE ENVIRONMENTAL CONTROL WAS SELECTED OFF AND THE AIRCRAFT LANDED SAFELY. SUBSEQUENT INSPECTION SHOWED THAT THE ENVIRONMENTAL DUCTING UNDER THE RT CABIN FLOOR, AS WELL AS COAX CABLES FOR THE NAV RADIOS AND THE NR 2 COM HAD BEEN DAMAGED. A WIRE TO THE ELECTRIC HEAT RELAY WAS FOUND DAMAGED AND MISROUTED. ALL DAMAGED COMPONENTS WERE REPLACED, AND THE WIRING REPAIRED.