Might be easier then for warranty if you just ship it back as-is, as any attempt to dismantle the pup might invalidate the warranty.

It might be as something as stupid as the tape wrapping around the coils shrinking over time and pulling on one of the coil winding output wires and snapping it, which would mean a full re-wind to repair it. Which for a ToneRider, would cost as much as a new pickup if you couldn't do it yourself.