It sounds as if the guy went in and asked what a specific repair would cost. If he were to ask you for the same, would you automatically include diagnostics, or would you offer the diagnostics as an option? And if declined, do what the customer asked of you. Minus your warrantee of course, I wouldn't offer a warrantee on the job if it was based off of someone elses diagnostics.I've taken a vehicle in for a blown exhaust donut before. told them it was leaking, and when I went to pick it up they said they couldnt hear anything and here's our bill for checking. Didnt even replace the damned donut and STILL wanted 85 bucks.