Sorry, there was more to the 20 points that I didn't list above.

"Inspect electrical for exposed wires.

inspecting and testing capacitors

inspecting fan blades

inspecting service valves

measuring temperature difference

monitoring compressor for proper amp draw, volt draw and wiring connections"

Do you think on this type of "tune up" they should be able to tell whether there was a leak or not, and where it might be?