The replacement transformer for the PS2E is a 'Signal Transformer' model DP-241-8-28 it is 115/230V Primary, 28V CT Secondary, digi key have over 200 in stock at approx US$33. All you need to do to mount it is remove the channel frame (the bit of metal around it for vertical mounting) and use the four bolt holes to screw it down. Keep the existing secondary wires with the faston insulated plug connectors, use some heat shrink. Note. you will need to drill out the pop rivet holding the mains earth connection to get the PS2E open and re rivet it when you reassemble it ( if you don't have one you can get a cheap hand rivet unit at your local hardware store ). AS always TRIPLE CHECK everything on the AC side.
Edit: and in this modern age, as with any dissasembly. Take lots of photos with your phone whilst pulling it apart. Saves some anguish later.