Help to acquire a "new" V8

Hello everybody,

I am currently looking for a "new" V8 again after selling mine a few weeks ago. By now I have seen some of them again and now also found one that would basically agree with me. The price's fine, too. It is about a mother of pearl white (must get used to it first) 3.6 bj 8/90. The car is running smoothly, I tried it today and it seems to be okay by the engine. I don't have any oil either. etc. found in the engine compartment, Servo also seems ok, timing belts don't have to be made yet, and the typical things like Lamda etc. I think it's okay. He's basically running perfectly. Okay, the car has a lot of blazes that I can hurt. I'm just gonna keep living with that. The rims could also be prepared again, but otherwise it is in reasonably good condition. There's nothing to complain about from the inside.
ONLY and now comes my question: The e-windows don't work at all!. No click garnix. Also since then the sliding roof no longer opens. Lt. Seller should be defective (junft from Audi) the control unit. Allegedly EUR 50,-. Hmm, my question: Is there such a separate control unit for windows and/or sunroof and if so, where does the part sit and what does it really cost. 50 EUR seems to me very inexpensive. Is the same part maybe. also installed in the Audi 200?? I've got one of those at the moment. you could possibly. Connect once if possible... To test.
The AutoCheck doesn't light up, but I'm going to tap on a defective lamp. I've done the 200. The check system does beeping anyway (tank was almost empty!).

And one more thing that needs to be done: At the front right, the flasher glass in the bumper is defective. How much does a part like that cost?? It must definitely be new.
Klime goes perfectly (thank God). Tempomat, he doesn't have a heater, so he can't break :-)
E-seats are ok, boxes work, With rust on the tail plate I am not knowingly sure if there is anything coming... But I don't think the car will be destroyed by me ;-)

So I haven't definitely bought the car yet. I agreed with the salesman that I'd take the car with me on Monday and put it on stage with the buddy in the workshop. Check the exhaust system and see the UFOs. I guess I should check some of them.

What could I possibly do? because you're still watching. Don't miss anything. A control unit for windows and a blinker cap could possibly be used. and still hurt. That's what the purchase price is for.

I would be very grateful for some tips on my problem.

Greetings Carsten Rensen
(Hopefully again V8 driver)