The Red cable across the top you refer to is the underside of the rear bulkhead. The underside of the rear bulkhead is normally pretty much covered up by the sound deadening material below it.
The sound deadening material deteriorates over time, and tend to droop at the edge of the bulkhead lip, exposing the bulkhead metal. The bulkhead is painted the original factory colour during the production process. I.E. Guards Red. (the red bit you see).
The plastic bit to the right you refer to is actually the rear chassis leg to which the rest of the car is welded in production. The tube coming from it with the yellow cap is the oil filler tube. This is welded to the right rear chassis leg during the production process. Again, this is sprayed the original body colour of the car during the production process. I.E. Guards Red.
This is how I/we know the car was originally red.
There is a white sticker on the inside cover of the service book, and an identical sticker on the underside of the front bonnet near the bonnet catch. (They should read exactly the same).
These stickers have all of the build specification of each individual car. The paint colour identification code is also printed on this sticker.
Paint code identification information is here.-
http://www.964uk.com/html/Colours.htm
Quite often the sticker on the underside of the bonnet is removed when a colour has been changed, or the panel replaced. Also, the sticker will be missing from the inside cover of the service book if it is a duplicate service book.
Just to put this to bed.
What we have attempted to do is give you the benefit of our collective knowledge and experience. This knowledge and experience is quite comprehensive, and has most certainly come at considerable financial cost to the contributors of this forum and thread.
The body mods and incomplete colour change suggests 'cost cutting' and potential covering up of nasties) This is not a good sign.We are merely bringing this to your attention, as you requested. Personally, I have parts bills exceeding £20k in the 5 years of 964 ownership, and that is doing all of the work myself.
I wish you all the very best with this car, and sincerely hope that it exceeds yours (and our expectations).
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As a final bit of advice, I would ask the dealer to send you images of the corresponding stickers and research the codes on them. They, along with the chassis number, will provide a useful heads up before you go to look. (Google it)
Good luck!