What was found
CLT - FLT 1104 - EN ROUTE PIT/MIA, CREW RECEIVED EICAS MESSAGE: LT BLD DUCT LEAK. CREW ISOLATED THE LEAK. CREW THEN EXPERIENCED A RIGHT PACK OVERHEAT AND RECEIVED THE EICAS MESSAGE: RT PACK OFF. CREW PERFORMED AN EMERGENCY DESCENT AND DIVERTED THE FLIGHT TO CLT. FLIGHT LANDED WITH NO FURTHER INCIDENT. MAINTENANCE COULD NOT DUPLICATE THE LT DUCT LEAK PROBLEM. HOWEVER, THE RAM AIR DOOR INLET ACTUATOR WAS FOUND STUCK IN THE CLOSED POSITION. THE ACTUATOR WAS REPLACED. (X)