If you are not good with electronics, the best course of action would be to ignore it and keep on using the keyboard as-is.

If you are a good hand with opening up something as complicated as a MIDI keyboard, if you know the basics of keeping it in good health while it is opened (not good to create more troubles when trying to repair one!) then you might be able to open it up, examine the situation carefully and see if it can be put back to rights.

Could be anything from a connector that needs reseated (connector from keyboard action to mainboard would be the suspect here) to a bad key sensor (not so good, the fix may have to be replacing the entire keybed) to something on the mainboard such as a bad chip or a cracked printed circuit board or bad connection. The latter is a VERY RARE situation to find, but deserves mention.

In my experience, dead keys at either extreme end of a keyboard are typically the victims of spilled liquids or pieces of solid flotsam and jetsam working their way down under the key via the cracks between keys. Guitar picks are notorious.


--Mac

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