First check: Put the PCB on it's side in front of you and support it with something so it can't flip over.
Now put your DVM in diode test. Hold the left lead (doesn't matter red or black) on the pin of the IC and the right lead on the actual soldering island on the PCB. It should of course beep right away. Check all the pins of that IC.Also visually check the socket.
If that is all OK, you will have to trace every track of every pin to which it should be going acc. to the schematics and test like-wise if the tracks are still 100% conducting.
Also remember: The self-test can mis-lead you. I've the same problem with the 2 Centi boards of Ckong and Gyruss. Replaced the indicated RAM, but still the same error.
I think it can also be another RAM causing it but it can also be the buffer IC's around the processor.
About the controller: Don't you just love this hobby ?
Small screws ? They are probably also non-metric, good luck finding those in Europe !
But I found this great source in the UK:
http://www.modelfixings.co.uk/fixings.htmGreat communications through e-mail, honest prices and shipping costs. And they have both metric and imperial sizes.