Audi Q5 with weird taillight issues caused by an incorrectly fitted trailer plug

Wiring in trailer plugs on late model vehicles is not as simple as it once was.
This week Jeff was presented with an Audi Q5 with some weird taillight issues caused by an incorrectly fitted trailer plug.
TaT members can read the full Repair solution at https://www.tat.net.au/tatsafact/2114
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