What was found
TURBINE ANTI-ICE VALVE WAS INSTALLED TO CORRECT UNCONTROLLABLE CABIN AND COCKPIT TEMPERATURE DISCREPANCY. VALVE OPERATED BACKWARDS CAUSING CABIN TO BECOME EXTREMELY HOT. RECOMMENDATIONS BY TECH SERVICES TO CHECK VALVE FOR PROPER WIRING REVEALED THAT VALVE DID, IN FACT, OPERATE BACKWARDS DUE TO INTERNAL REVERSED WIRING ON THE VALVE MOTOR. WERE ADVISED, AT THAT TIME, THAT 3 OR 4 OF THESE VALVES HAD BEEN FOUND WITH THE SAME PROBLEM COMING OUT OF OVERHAUL.