If this had got to court then I think that they were doomed anyway, just quoting the handbook's advice about no stickers should have been enough.
Nevertheless at a technical level I'm puzzled that the fault you reported (interaction between heated read window and radio reception) could be caused by damage inflicted at removal of the sticker. The aerial and the heater tracks do seem to be separate circuits, so damage to the tracks of either would cause a problem in that area, but not interaction. Unless the glue remaining from the offending sticker left a conductive residue (which a good clean with Isopropyl Alcohol should sort out).
I'm assuming it's working well now. But do you know what they actually did to fix it ? Was the bill itemised ?
Nevertheless at a technical level I'm puzzled that the fault you reported (interaction between heated read window and radio reception) could be caused by damage inflicted at removal of the sticker. The aerial and the heater tracks do seem to be separate circuits, so damage to the tracks of either would cause a problem in that area, but not interaction. Unless the glue remaining from the offending sticker left a conductive residue (which a good clean with Isopropyl Alcohol should sort out).
I'm assuming it's working well now. But do you know what they actually did to fix it ? Was the bill itemised ?
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