If I’m reading the schematic correctly, it looks like your alarm light is powered on terminal block 5 with common going to the N block. This is similar to my own septic alarm scenario. I don’t see the alarm buzzer on the schematic, but it might be tied into the same terminal 5+N connections.
If the light turns on in response to any event, then I think you can get notifications in similar fashion to what I have done. I’m getting reliable notifications to my phone when the septic alarm goes off. Have a look at my post, especially the last post here…it could be a start to solving your problem #2…
P.S. Stay clear of that huge capacitor in the control box!!