Sorry to be the bearer of bad news -
http://classic-computers.org.nz/blog/2013-01-15-retr0bright-only-temporary.htm
The best success I had was with an Amiga 600. It lives in a dark place and never gets sunlight. It has started to revert to yellow
Interesting that the euro ones were made in US, according to the replacement backshell it was assembled in Ireland. Any other numbers that could help figure out what it started out as? I have the whole thing open at the moment.