Arrived onsite and was shown to the foyer light above the stairs that the switch as no longer working for. Upon inspection i found all the switching in the gang boxes i passed and opened to all be low voltage smart switches, or very early touch to turn on style switches, or wireless 3 way switches. I found the one switch in the downstairs location had black behind it and had obviously been blown out, and the one upstairs was non operational at this point. Based off the wiring available I couldn’t just replace them with standard 3 way switches, so i used cassetta switches to remedy the issue. One other issue brought up with the foyer chandelier was the attic lighting which had no power upon our arrival. Tyler went up into the attic and did a thorough search of the lighting system layout up there and found the initial switch to turn it all on had gone bad. So at a minimum, i offered cassetta smart switches to add a new location at the bottom of the stairs, and a new on off dimmer style