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A leak probably wouldn't cause a "sudden" drop in pressure. It sounds more like the system has more users than it can supply and pressure drops when someone else turns on their shower or flushes their toilet.
If you are looking for a leak, and you can build up the pressure inside the thing, there are two ways you can find the leak pretty effectively. You can either submerge the object under water (if it won't damage the object), and look for bubbles rising through the water from the leak. This is very effective for finding leaks in inner tubes and tires, for instance. If the object can't be submerged underwater for some reason, then apply a little soapy water to the areas that you suspect the leak to be. If you see soap bubbles growing, that is where the leak is!
A leak in the slab is an under ground stream or broken line under the slab. It is NOT the same as a belly in a sewer line.
Lots of things
Code P0442: Evaporative Emission System Leak Detected (small leak) One common cause for this can be a loose or poorly sealing gas cap. Also there is supposed to be a soft rubber o-ring type gasket on the gas cap, that seals against the filler neck. If it is missing or damaged it may leak. Old, dried, and cracked rubber hoses anywhere in the system may also account for the leak.