Yes, in the later PS-2 3V they had flash boards that MTH could reprogram. Had a special chip that could be read/write vice write once. If you had a GG-1 operating panto, you needed the GG-1 flash board. If QW you need that, if small smoke you needed that. In the 5V world it was special boards for GG-1, trolley, and articulated chuff. 3V had more memory so several flash codes could be combined. PS-3 still needs those codes. That is why I pushed MTH(Jason) to get those PS-32 flash codes out. GG-1, small smoke, trolley, COORS etc...
I was doing so many PS-2 5V and 3V repairs, but needed those special features that MTH had to get them on the fast track.
As far as the newer boards, MTH has seen processor boards get corrupted. If the FPGA (john correct me if I get it wrong) has to store memory items in the correct spot. If it doesn't the board can no longer function correctly. It does not know how to start up right. I have had a few PS-3 do that with just a normal load early on. Had to send board back to MTH so they could reflash the board. Remember the document about Morse code type after a reflash? Certain Morse code meant a corrupted memory. G
