Tape ripped off Ram Expansion Card Green??

[Super TWiT]

I purchased a ram expansion cover for my a500 a couple weeks back, and so I took off the electrical tape which I had used to cover my 512kb ram expansion.  When I took the tape off, it actually took part of the green layer of the circuit board off, exposing a silver layer.  I haven't plugged the Amiga in since, and while I think it just took off some paint, I wanted to check here first to make sure I (the tape) didn't break anything.

[Super TWiT]

I have some pictures (sorry for the quality, lighting is poor!), and on re-examination, it looks pretty nasty.  On a side note, I am trying to get to the underside of the a500 motherboard to check some solder points, but I am bocked by that metal shield.   How do I take that off?  It seems to be locked in place by the thumbscrews on the ports.

[Super TWiT]

@CritAnime Thanks CritAnime, but I live in the US so I am not sure you'd still want to ship that far.

I have a continuity meter, and a good magnifying glass, so I'll check out the board.  The tape wasn't there originally, I put tape across my trap door expansion slot since when I bought the computer, it didn't come with the cover.  I recently bought a cover off of ebay, so I removed the tape, and also some pcb pieces.... As for getting to the underside of the amiga, I am having some mouse problems, and I want to check the continuity of the mouse port itself.  How would you go about remove the port screws? (you mean the thumbtacks on the ports right?)