At the current resolution? Tell em SURE!
I was just reading a thread on an auto site. A guy came in an told the mechanic that his carb needed replaced. The mechanic said, 'well run a diagnostic and see what the problem is'. The customer said ' I CHECKED IT OUT... Its the carburator... Replace it ' ... So they did without running any tests. Guess what... It wasn't the carb and the truck still ran like crap. So the customer is all pissy because they didn't fix it, but the mechanic reminded him that they wanted to run a diagnostic to determine the problem. Turns out it was just a lose hose and the customer paid twice.