Today a friend brought me his DMT-8VL, 'cause it wouldn't turn on.

After taking a look at the PSU, I found that the primary winding on the transformer went open.
What are the odds for this to happen?
Does anyone know where to get a new PSU-trafo for the DMT-8VL?
Or how to repair the old one?

And: does anyone have the schematics for the PSU?

Thanks in advance,