What was found
RIGHT PACK FLOW CONTROL VALVES ARE CLOSED DUE TO FCVS FAILED CLOSED, FCVSS LATCHED CLOSED BY CABIN TEMP CONTROLLER (CTC) BECAUSE OF FAULT, OVERHEAT, OR PACK CONTROL SWITCH COMMANDED OFF, OR NO PNEUMATIC AIR AVAILABLE TO PACK. REPLACED RT PACK UPPER FLOW CONTROL VALVE, ON TEST FOUND RT SEC HEAT TEMP SENSOR OUT OF RANGE. REPLACED SENSOR, CHECKS OK ON FURTHER TEST.