Welcome back.
I know where your coming from since i have come back to miggy's only recently.
As for the A1200 capacitor C304, there is a guy that still repairs Amiga's in France and you can always try amigakit.com (it's in the UK) they sell lots of amiga stuff and may also be able to fix the problem.
Or you can post a thread in Hardware regarding trying to fix it.
Welcome and Enjoy. :cheers: