Leaking Liquid From Side Regulator

The CO2 regulator located on the side of the Viper unit is set for 30 psi and provides Co2 pressure to the expansion tanks. When the liquid side of the bladder pressure exceeds 30 psi CO2 gas is pushed back thru the bleed hole in the CO2 regulator. If liquid is leaking from the regulator bleed hole:

1. The expansion tank rubber bladder has a tear or hole and expansion tank needs to be replaced

2. The regulator is not set properly allowing bladder movement that caused damage to the bladder

How to differentiate between Co2 solenoid or expansion tank​