Do you mind checking out the images here?
https://mac68k.info/forums/thread.jspa?messageID=966
They are as far as I can tell a match to what I have. Normally when I see a rectifier its four diodes. But I only know the very basics. I can understand most things and fix as directed, but I lack the knowledge you do for doing anything beyond basics. So I am a bit out of my realm here. I really do appreciate any help!