Your best bet in regards to service/ workshop manuals is to register for free on erwin.audi.com, explore the site a bit, then pay 8 euro for an hour and you'll be able to download what you need.
That's what I did. Paid for an hour and got official, up to date manuals and service bulletins with...
The car the replacement ECU came from may have had different options than yours.
Eg. Auto trans vs. Manual, fwd vs. quattro etc.
Yes there's a chance it'll be plug and play but more likely not. You'll need someone with vcds to do it for you. It's not a DIY job unless you know what to change in...
Damn that sucks. Yes ideally you want the same pn ECU. SW version shoudl be close to yours as well. Many modules will likely have to be coded, enabled/disabled anyway (eg. If you get ECU from manual car it'll have to be coded for auto etc.)
Electricity doesn't like water, looks like your issues surface when car gets wet . Inspect fuse box for water ingress / corrosion.
Remove plastic cowling below windscreen and check your ECU or the cables aren't swimming in puddle of water
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