> 
> It's really easy to break those little defrost wires.  One pass with a
> razor blade can wipe out all of them.  I once removed the tint from a
> rear window for reasons similar to yours, and even though I was very careful,
> I broke two of the lines.  I would leave it to a professional, and let them
> know in no uncertain terms that they had better not break any of the
> defroster wires.  Try to find a place that can supply references, since
> I don't know of any way to repair the wires once they are broken.
> 
> 
> -David
> 
  I've heard that a small drop of conductive epoxy will sometimes fix those.

  Dave