Halifax, NS
Just another suggestion. I had an I500 do the same thing once, and like yours it was only when the pf was down, not up. What I eventually found was a lamp socket screw had fallen out, and when the pf was down, the socket was just touching a switch causing a row short.
Like others have mentioned, go into the switch test function and activate the suspect switch. You will likely see 2 switches activate at the same time. Check each switch on that row and see if something is touching, specifically looking for loose wires and things of that nature.
Seward, AK
