CO2 Regulator Question

[TheReeferer]

On my CO2 regulator there is the tank pressure gauge and then the working pressure gauge. Last night the solenoid closed for the entire night (tank valve is open) and I woke up to a 0 working pressure (tank pressure didn't change). What does this mean? Does it mean I have a leak somewhere?

 

[oreo57]

If you didn't back off your working pressure adj. to zero you got a bad regulator..

 

[TheReeferer]

No I didn't touch the regulator valve, only the solenoid closed...

Should I use soap to try to find leaks?