Cross posting. Thats where you have two different threads at the same time, and you discuss the same problem in both threads. People go crazy trying to help you, because they have to find two different threads to understand what you need help with, what you have done, and what you are going to do.
No I don't know that what it cost to compleatly fix and test a A11, (3,000 dollars?) but the cost of an after market VR is a few hundred bucks. There are any number of folks here who stand ready to help walk you through the operation. And a new head, will not fix anything on your set. Its not the head. Its the VR. If you spend 3K on a head, install it, and brother, if you think putting in an after market VR is complicated, look up how to replace the head, then I will buy a after market VR, and a round trip ticket from Germany and install it for you. Because that would be cheaper then a new head you dont need.