AC blowing warm in MBZ City, anyone know a reliable cooling system shop?

[grahamcole]

My Pajero's AC has been weak for about a week now, it's not blowing hot but it takes forever to cool down and the moment I stop at a signal it just gives up. I'm in MBZ City so I'd rather find someone close by than drive across town in this heat. A colleague mentioned Reliable cooling system and AC repair in MBZ City but didn't give me a name and I'm not sure if he was just being generic or actually recommending somewhere. What I'm worried about is a shop just topping up the gas without checking for a leak and then charging me again in a month. Has anyone here had a proper diagnosis done locally? I'd like to know if it's worth paying for a leak test first or if I should just take the risk and get the refill.