From what I can gather, there is no clear difference in the warranty between software and hardware modifcation. The clause dealing with exceptions, in section 3, states that any Tampering or Modification voids the warranty. So, technically, even restoring it to a virgin state voids the warranty.
However, as much appreciated as the post was, my original question remains unanswered. Has anyone tried redeeming their warranty, and been denied because of software modification?