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AFAIK, they dont sell the electronic component alone -which is the part that houses the ports wedging into the lever body, and the switches that go under the paddles. You can usually buy the top bracket as a whole, but they just end up being more than buying a complete shifter on the used market:
That is if you're 100% sure that the issue is with the actual microswitch thats inside that electronic bit. Maybe the rubber pointy bit (that touches against the paddle) on it just worn down a bit and needs something to fill back that spot. You can also buy bits & bobs for the paddles if the issue is on the paddle-side.
You can quite easily (and non destructively) take apart the paddle part of the shifter, and check if it reacts reliably if you push the microswitch by hand, not relying on the paddle mechanism.
If you dont want to go through all this, contact Pawel at Di2 gp, and if there isnt a solution, consider donating your bricked shifter for science :)
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kiskubai
@Bossman
Are the buttons on the right shifter replaceable?
Developed a fault where it only works every so often. Narrowed it down to this by switch the hood buttons to shift and all is fine.