Hi Monzta,
I don't remember whether your car is an Alcyone or a run-of-the-mill UK model.
David Hendry cars might be close enough to you to be worth a visit. We haven't gone there ourselves, but the story I heard is that they were official Subaru dealers who lost their franchise for servicing imports, so now they specialise in servicing imported Subarus.
http://www.dhcars.co.uk/
Our local Subaru dealer services our import on the quiet because we have another Subaru that is not an import and they don't want to lose the business. They refused to help Matt with his SVX though and refered him to us because, according to them, we know more about SVX's than they do. (Which might not be too far from the truth
)
I once had a long conversation with a manager from IM and he told me the official position is that they will supply parts for imports, but won't carry out any servicing - and (off the record) they don't really care about dealers servicing imported SVX's because it's not a current model.
Most Subaru dealers are clueless about the SVX. A few dealers we have visited had never even seen one until we drove up. Do yourself a favour and get a set of service manuals. Then leave them on the passenger seat when you book the car in for service.
At one time I thought we had a diff problem (that's what two Subaru dealers told us). I went to A&A Transmissions in Slough, who seemed to know their stuff and instantly diagnosed that it was a wheel bearing and not the diff at all! That's where I would go if, heaven forbid, the gearbox failed again.
Actually, given that practically every SVX ever made has had transmission work done on it, you might find that transmission specialists know more about it than anyone else.
Phil & Belha.