Really? I thought I had read a few years ago that they stopped doing work on Pegasos and Efika. I might have to write them. I've got one dead G4 module now. I _think_ ESD got it so it might need a replacement CPU and I don't know if they still have any left in stock. It'd be worth dropping them an email to check.
Thanks. I never wrote them before since I thought it wasn't an option any more.
They still did as of last year. I got my G4 1GHz module fixed in January 2016.
Bill Buck got me in touch with Thomas Knabel of bplan who was very helpful.
Cost around EUR 150.