Update: A simple panel swap in a 1980s house turned into a 3 day job
Had to replace an old Ademco panel in a brick house last week. The main power feed was fine, but the old 4-wire run to the keypad was totally shot inside the wall. Spent a full day just fishing new wire through that plaster and lath. Ended up having to open up a small section of the ceiling in the next room to get a clean path. Anyone else run into these hidden wire fails in old construction?