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Logitech Bus Interface Card

Have you cleaned both mice? Just making sure since that is the most common cause of this problem.

If the pinout information I have is correct, the horizontal movement information is conducted through the lower left pin and the pin at the right of the middle row of the connector. It is possible that is wrong so check if any other pins are loose or broken. And follow the traces from the connector to the central chip to make sure the trace isn't broken.

I couldn't see the picture so I am hoping it is similar to the bus card I have.
 
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