Boeing have already revived couple of similar reports from other 737-800BCF operators. The root cause for this chronic left mix manifold sensor fault was determined to be poor mixing of the hot (TCV open) and cold air at the left mix manifold sensor. This resulted in the sensor detecting about 200 degrees Fahrenheit air temperature in a heating mode for more than 6.2 seconds, thus triggering the Mix Manifold Temperature Sensor Short Fault. The solution is to add a 200 ohm inline resistor to the mix manifold sensor. The resistor(s) are to be installed near E3-3 D41800P (reference Wiring Diagram Manual (WDM) section 21-51-12) for both left and right (optional) mix manifold sensors. For detailed work instructions, PNs and RDR (Repair and Deviation Record), please have your avionics engineer submit a Service Request.