replaced blown fuse in PS and it blew the fuse for the transformer. Replaced the transformer fuse and left out the ps fuse and it is back to where it was. hmmm
If you have a capacitance meter, check the caps on the PSU's main board and make sure you don't have any dead ones. Following that, if you have an IC Identifier, check that it reports the main power transistors properly.
Check all of the solder connections on the board and re-flow the solder on all of the pins. More often than not this will fix a lot of problems without doing anything else. Most of the monitor and PSU faults I fix fall into this catagory. I quite often do this before I even think about doing anything else.
If all of the above checks out, then you have a short circuit somewhere.... It's certainly a PSU Fault.
A at worst case a new PSU is very cheap.... about $40 USD at most. £25 GBP. Which makes it pointless repairing it if there are a lot of parts in a faulty condition.
The sticker you found in the bottom of the cab is a Wells & Gardner Monitor Part Number for a 19" K series monitor. It's possible that your cab has had a monitor change at some point.
Best Regards,
Julian (Fozzy The Bear)