The switches in the handle are the most common failure, along with the paddle gear. You can find repair kits online with new switch harnesses and gears for about $30 from Amazon/eBay/AliExpress. The door controller is (as far as I have found) only available from salvage, so eBay is your best bet either getting a whole handle (typically under $200), or just the controller (typically under $50).
See my other video on door/handle adjustments and replacing the controller here:
   • How to replace a door controller in T...  

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