I rarely click unsubscribe unless they are legit businesses like Go Outdoors etc. Anything else and I think it just shows the address is live and monitored.
My point was more aimed at manufacturers being a bit more closed shop from the DIY, but we all know that's never going to happen as its a strong revenue stream for them.
How often do you have it serviced?
Sounds like a tamper issue so either contact the installer, a reputable company or get the ladder out but beware there's high voltage around the pcb.