I'm not much of a guru when it comes to the guts of camera systems, but the problem only showing up on your JPEG images doesn't really indicate a problem with the sensor. I would think that if there was something wrong with the sensor that it would show on both the RAW and JPEG images. Perhaps there is an issue with the processing the camera performs to produce the JPEG files. The camera doesn't do as much processing on RAW files, so that would make sense it wouldn't show up on the RAW files.
That's my take. But, like I said, I'm not a guru. If I'm wrong, hopefully someone will correct me.
It may help to post the two pictures so everyone can see what you are referring to.
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