I recently bought for really cheap a Viz Triple Supplyst WP708 supply.
Right side works fine, but the left display does not light up. Other than that output is fine (left side too). I tried to find manuals or service manuals but I found none. Probably dates back to the pre-internet era...
I opened it up, looks like a nice layout but before I start poking around wanted to check if anyone had anything on it. I seem to recall having seen a similar unit on one of the videos here but I may be wrong.