Upon arrival customer stated master bedroom had very strong gas smell. Before opening up unit small gas smell was present. Ran system in heat mode had no gas smell. Shut system down had strong gas smell at top of the gas valve. Leak tested inlet and out let of gas valve found no leaks. Determined gas valve was leaking at top of valve. Shut gas valve off to prevent leak, confirmed with customer Oem gas valve needs to be ordered system is down GME80805CN - 1605253991