I suspect the rear window defroster/defogger does not work . Although the lines (?) dont seem to be damaged the plastic(?) panel where they are incorporated seems to be ungluing itself from the glass in certain areas as a result of window being hit a few weeks ago by a hail storm. I tested the circuit with a test light and I have power on the left side (dark) of the window near the frame on all the line top to bottom. NO power on any of the lines across the window and No power either on the right side darker area near the frame. What should I do? Do I have to replace the entire window?