Stromer rear wheel magnet? Control unit won't show speed.

I had a slow leak and finally got around to changing my rear tube. I knew it was going to be a pain. After I replaced it, the control unit doesn't register speed. I talked to a dealer service center, and they said it can be that the magnet on the rear wheel is misaligned.

Anyone have any info on this? I was told it is located on the non-drive side of the rear wheel. I can't seem to find it, but I also don't know exactly what to look for. I just want to make sure everything is in working order before my 2-year anniversary, and replace any warranty-covered parts if the need is there.
 
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