Could be worse
Wow, that's impressive!
We had intermittent alarm system faults a few years ago. Was a fairly new system, so I suspected it was a battery fault and just called the alarm engineer out as they’d recently installed a fresh backup battery. The alarm panel is installed in our loft, adjacent to a dormer window.
Alarm installer came in crawled into the loft and then backed out immediately and told me he couldn’t fix it. Why not? As it turned out wasps had come in via a tiny gap in between the roof and dormer flashing and had completely enveloped the alarm unit. It was HUGE, spooky wasp nest and full of rather angry wasps. It looked bloody terrifying.
Anyhow after dusting them for a week or two it was clear that we’d cleared them. By the time we pulled the nest off the wall, we found that that “eaten” most of the backing plasterboard and gotten well into the alarm unit. We cleaned them all out and cleaned the PCB as best we could. Luckily the wiring was all intact (unlike mice or rats). We put it all back together, reset it all and incredibly it came back to life!