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That looks more like sticker residue or dirt to me, because the pins are all still shiny.  That's the CPU, so if it's bad, things really won't work. I would try wiping that off with some rubbing alcohol on a paper towel.

I could probably do testing if you need someone!

The original board only has cut-outs on one side, right?

My grape tray loader has been 100 percent reliable for me, despite having a rusty internal shield from damp storage.  I don’t know what the slot loaders are like.

iFixit seems to think so.  On the iFixit for that machine, it says keyboard for 15 or 17.

I hope you mean the line filter.  Do not remove the DC filter, bad things will happen.  I think you mean the Paper RIFA-Style caps like in the AC side of things.  Macs have similar caps that also happen to go pop.

Seems like you don't have horizontal deflection.  Check the horizontal connections on the yoke and look at the PC board to see if anything (big transistors or caps) look like they're distressed.  You might have a bad HOT.

I second the above.  I really wouldn’t remove that, as it’s very likely an implosion prevention band.  It might implode trying to remove it.

I think this is what would be called an NTC thermistor.  It limits inrush current when the machine is powered in.  It then heats up and the resistance drops to almost nothing.  I wouldn’t replace it with a fixed value resistor, although I’m not sure what would happen if you did.

That looks like the brightness is set way too high, rescan lines.  Adjust the internal brightness control?

Also, please wear gloves.  That battery crap is no joke.

By any chance do you have a scope?  I would test that 50 MHz clock to make sure it's stable.

My CC has problems that are related to the edge card I think.  Sometimes I loose green as well (jostling the machine seems to fix this), and I also seem to loose working SCSI until I reseat the logic board.

Bad ROM contact? Try the rubber band fix.

Nope but it looks super cool.  Gonna have to crack it open when it comes to figure out what it is.

All I have to say is holy crap, what a lot of time and effort!  More than I would put in! Kudos!

It's not that the USB drive can write GCR 800k disks.  It can write 1.44 MB disks.  It just happens to work writing 800k images that don't take up the full disk.  I doubt they would work on a machine without a superdrive.

If the printer is AppleTalk, the WiFi extender may not be passing those packets. Edit: Oooh sweet 1k posts

Did swapping that cap fix this issue?

I wound up salvaging what I could and getting rid of the rest of the machine, as it was a total rust bucket, not to mention the problem with the logic board.  I did get some nice parts out of it though!