Hi Simon, congrats on your new piece!
Without a doubt, you should change out all of the electrolytic capacitors. If you are good with a soldering iron, you should have no problem doing this. Speaking of capacitors, have a look at your power caps, they are parked right up against the metal transformer "lunchbox" and see if they are leaking or not.
Also check the trim potentiometers and replace accordingly. This job also within reach of a beginner.
Bulbs are available from member Dillen (Martin).
Good luck!