Where can I get a replacement 6 pin connection transformer for a Seimens 750 laptop circa 1990?

It is a metal boxed laptop used by Siemens engineers in the very early 1990s and is a real collectors piece, the transformer being the size of a brick and the whole thing was extremelyy expensive at the time. It still works well, but someone put the six pin plug in the wrong way and snapped and bent most of the pins. Cannot get another as is well obsolete, but like a favourite pair of slippers, can' t and won't throw it out as it has some major research works I have done, still in it.