Xerox support would have asked you to follow the directions from that link and if it wouldn't work they would have done as V.Andreev says, send an engineer to change the memory.
You should have a 1536mb memory in the printer right now and you could probably replace it urself but finding the correct ram module is a pain.
Please remember to select "Accept as Solution" for posts that helped you solve the issue.
Many thanks to V Andreev and Kimzi
I have passed this all to Xerox support via our device supplier.
Hopefully this will result in a hardware fix.
OK so if there's anyone still following this thread, here's an update...
An engineer came in to look at the repeated 024-370 crash issue. The machine freezing incidents were occurring at around weekly intervals and either occurred during print of copy jobs. So it was fairly clear that the problem was not specifically related to prints/print drivers (as suggested in the official Xerox cause listed agains the above error code).
According to the guy visiting, there is no way to stress test the RAM or whatever. His laptop came equipped with a troubleshooting procedure for each code. The cause(s) given for this code included failing RAM, Hard Drive or ESS Board (?). So initially the RAM was replaced, but the machine crashed the day after - same code. So yesterday, another guy came by and replaced both the hard drive and the ESS board.
Hopefully this will resolve the issue - I'm not really sure what there is left to replace!