> Hi Toby,
> I have problem with the said subject, it shows PC BUS ERROR
> 000359C after running for about half hour. I have swap the
> board with another board and it is OK, but when I put it
> back the CPU PCB back again it shows the same error. Could
> you please kindly tell me how to solf this problem.
>
> Thanking you in advance,
>
> Jan.
>
As a wild stab in the dark I'd say it sounds like it's overheating.
Check none of the heatsinks have falled off or come loose.

System16 - The Arcade Museum