I can't find the electrical schematic of how the TAT and TWS works but it was posted here hundreds of posts ago. Maintenance disabled the TAT but didn't realize the R5 relay also affected the take off warning system. More knowledge of the systems might have prevented this crash. The R5 relay plug in receptacle might have been corroded and removing it and testing it might have not proven anything. The corrosion in the receptical was probably the reason for the failure. Spending many years working on electronic devices I have found once you move a device everything changes. All the evidence goes away. Sometimes temperature, vibration and moisture can change how electronic things work. They could test it still in it's socket but after the jolt it got crashing it might have jiggled back to working condition. R5 is the most likely cause of the failure of the take off warning system. If someone can find the post with the schematic please post it.