[Barrie Yates]

A piece of cardboard under the engine for a few hours immediately after a run will tell you if you have any oil or fluis leaks, but watch out for condensation if you have a/c fitted and it has been running
Get someone to check the tension of the belt/belts. You may need to refer to a Haynes Manual or similar to find out what the deflection of the belt(s) should be at a specific point.