I have some experience of this in relation to the Polish
Puchacz (6000 hours) but the matter seems to have been
resolved - at least in part.

Send it away to Poland, and it comes back brand-spankin
clean with life extension to 12000hours. Its effectively
a new glider, and looks very attractive. Wasnt crazily
expensive, but the guy who had to tow it there....
:-s