Call up Yamaha. They will fix it for free as it is a manufacturing fault.
Testimonial: "Thank you very much for that timely information. I'll call Yamaha today and see how they want to proceed. Thanks again."
If you want to solve this problem by yourself, I did what is following : Try to get the service manual of the CLP 110, for instance here:http://www.free-service-manuals.com (you can download it for 5 $ ), follow the desassembly procedures from the manual until the step # 15, disassemble the keys B and E ( they all have the same issue ). Prepare a kettle of boiling water, dip the part between the fulcrum and half of the key fault in boiling water for 20 seconds, with gloves, slightly twist the key in the opposite direction of his default, and keeping it in this position, refresh the key under cold water to stabilize it. Try the key on the keyboard. If the correction is too strong, it can be reduced by doing the same process in the reverse direction to get the right correction. The problem is probably coming from an bad inner constraint into the plastic of the key during factory process; which appears later, mainly if your piano reside in hot climate....
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