Yeah, I might be reaching that point...

Yeah, I might be reaching that point...

@B.Will Would there be a way to test the wires before just replacing? With the HS220 at 100% and the TV off, I'm getting ~124V at both light 1 and light 2.

@B.Will Thanks for the feedback and advice. I've spent a couple hours removing ceiling tiles, tracing wires. The old switch box is on a wall, and I won't be able to assess with 100% confidence what's...

@B.Will Devices on circuit B do work normally when circuit A is off.

The short story is that I just installed an HS220. For a while, it looked like it wouldn't dim, but it would turn on and off. Today, I discovered that if other appliances are turned on (they're on...