Lost all power to control panel All fuses are good All relays are good What else do I look for?
Can't speak to Series 3 machines but I believe that the control panels are the same as the original 400 series. I replaced the panel in my 465 due to it going out. It is a fairly common failure.
You will have to go "old school" on this one. Start at the battery disconnect switch if your machine has one and work your way forward. You could unbolt the fuse panel, pull it up and check the bottom side or the rear side where the power wire comes in and check for a bad connection before the power gets to the fuses.