I havve an Emerald ES-2 which seems to be 1991 circa...... with Air Buttons, I was not here when the system went bad, so I do noit have a history.

I tested the output of the GFCI and power is coming outdine, even though the system resembles not having any Power. Nothing works.

The Circuit Board is difficult to remove and inspect, even with the leads disconnected.

Is there a primary set of steps for things I can check to rule out first problems ?

The Main Fuse checks out ok. I am a notice, so not real sure where to start.

Thanks for your support

Air buttons with a circuit board...

Is this circuit board you're talking about located where the air buttons are?