Customer requests a plumber to come out to perform a pressure test on the gas line. Heating tune up performed today on an Amana gas furnace with straight cool condenser. PSC blower motor and capacitor are acceptable. Blower wheel and evaporator coil are slightly dirty. Attic is very low on insulation. Furnace safeties and functions are working properly. Technician smelled the odor of gas outside by the condenser. Technician turned off the furnace and the gas water heater pilot and watched the meter to determine there is a slow leak somewhere in the system. Requesting a plumber to come out and perform a pressure test on the gas line. Gas was turned off at the meter before departure.