6) The window relays are in the immobilizer. Have you pulled it out to have a look? The immobilizer's mount location is notorious for water intrusion and the windows are generally one of the first things to be affected by a corroded immobilizer board.
7) It may be worthwhile to check both door harness connectors (in the door jamb) for corrosion on the pins. Otherwise, some disassembly and testing of the passenger mirror may be required.
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