Cost? I presumed you wouldn't charge yourself.
Interesting question, I suppose because a few give so easily, answers so valuable, such a question could arise. Do you work for the government?
Only someone who works for the government could ask such a question.
I don't exactly know where to find someone who will diagnose by directive, or try to put off the inevitable, but I would suggest an independent.
Bosch Master, ASE Master, L1
33 years MB technician