In the UK you could try,

Brian Mickleboro,
6 Fairway
Bishop's Stortford
Herts, CM23 5LT
em. bjmick@aol.com
ph. 01279 755862

or

KL Camera Repairs Ltd, Rayleigh Tel: 01268-775781.

http://www.klcamerarepairs.co.uk/

I have not used them but have read they have a good rep.

I have used and can vouch for,

Jurgen Kuschnik http://www.jurgenkuschnik.com/

but he's in Germany.

Hope this helps,
Jeff