Hi Took my car in for a B service at a Mercedes main dealer as I’m on a service plan, and while there they informed that they’d spotted fluid leaking under the vehicle. They asked me if I was ok with them investigating and I said yes. Turns out it was air con leak from the air con condenser. I then gave the ok for them to fix as price was acceptable to me. When I asked for the grand total they had added on £130 for diagnostics. I do understand why they have to add this on but considering I am letting them fix the issue it seems a bit much? Or am I being unreasonable? Thanks.