I would expect they should have some idea of what is going on, although sometimes things like a waterpump can leak and then not leak.
Techs have different skill levels. A saavy tech would hold the pressure and monitor is for a few hours if needbe when there are no external leaks. IF pressure drops and still ne leaks are found, (assuming his equipment is good) then it is causing internal leakage and can be further diagnosed. Pulling the plugs and spinning the engine over will show a head gasket or possible intake leak. Checking the oil after setting overnight, and slowly opening the oil pan plug will show coolant that entered the crankcase that is indicative of either gasket failure.
Monday, September 10th, 2007 AT 7:35 AM