I have a cervelo P5-6 2017 with magura rim brakes. The rear has been a forever ongoing issue.... With leaking somewhere, constantly need to be bled. Already replaced the full rear set cable/lever etc but same thing.
So you have the calipers and shifters? For front and rear? New, and hopefully not defective? I know they had so many issues with these.

So wondering if what you are selling may be what I am looking for.
I don't actually know how this forum works and if I can give you my email or not. It is kbeckvet@gmail.com
Karri