Do I have to pay the $100 diagnostic charge if I already know what the problem is?

Thanks for the question, Clarence. The to stand behind the repairs we do have to diagnose the issue. If you would like to just install a part we can quote that also as long as you understand it may or may not fix your issue. Once the part is installed we cannot return it. Thank you, Robert Campbell Service Manager 704-884-2210

No just pay to have it fixed