How do you track down a RAM error

I asked the people in the repair and arcade newsgroups and didn't get
any responses. I have a game that runs off a M68000 and boots with a
RAM error. There are 6 surface mount RAMs. I don't want to remove and
install them all because of the hassle and perhaps damaging the board.
How do you track down a RAM problem? It seems it is not as easy as a
74xxx chip. Could someone provide details a maybe a few methods so that
I know for sure which chip if any has the problem. I think I have all
of the tools, just lacking the knowlege.
Thanks very much
Uriah

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