I seem to have what I initially thought was an exhaust leak, but after further investigation sounds more like an air leak round the right rear back side of the engine. I wouldn't ordinarily be concerned and just get it into VW to looked at. (It's actually the first issue I've ever had with my T6) However, I'm going on holiday next week and my colleague takes over my business and has a lot of jobs, and a lot of miles to cover whist I'm away, so don't want a call saying the vans packed up etc. It's not effected any power, or brakes, and no warning lights have come on. It's just a general hiss on tickover, that you can hear when you blip the throttle. Any previous vacuum issues would be appreciated.