The technicians performed a maintenance on a seven year old air conditioner. We checked the motors, capacitors, refrigerant charge, static pressures, temperature differences and washed out the condenser. We found that the system was a little low on refrigerant, I checked the evaporator coil for a leak and couldn’t find one. We were told to charge it up free of charge and we’ll come back in a month or so and see if it has leaked back out.