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With the logic analyzer I could see it writing 01010101 and 10101010 to bank 3 of the RAM, but it was reading back 01011101 10101010 - bit 5 is stuck high, that RAM chip must be bad. ...
According to the D67 scheme?

... I have a Chinese USB EPROM programmer but I don't think it can burn this type of PROM. I have a very old Stag PP39 programmer that might be able to do it. I'd have to find a blank chip, too. Otherwise I'm sure some sort of adapter could be made.
If we are talking about replacing and programming ROM, then any eeprom will do. I bet w27c512.