aquatec booster 8800

[LOVEROCK]

seems to be on, but water is just not pushing as it used to, i think something has died or is on the way out already, anyone know how to trouble shoot what part inside is broken?

 

[LOVEROCK]

PSI guage broken too, unsure of pressure , but def feels like im pumping water without a booster , its back to slow drips now