Except for 3 coils all the others were new. The knocker, and the little tilt and game over coils are the only ones I didn't replace. I have kept the old ones as backups and plan to put new wrappers on etc.

To test a diode I have to desolder one end first right?

As for the coils, if I desolder one of the sides is that enough  to eliminate it from causing problems when I turn it back on? For example if I desolder one side of the knocker coil will that be enough to see if that is the offending coil or not, ie will the game then boot if that was the problem?