I'm trying to find someone who understands hifi to sort out some problems with my A400 GTE (Tom Evans modified) and wondered if any guys on here do that sort of thing. I live in South London and would prefer someone local if possible. Could you let me know if you can help or can recommend someone else who does. I've spoken to a couple of Pioneer Service Centres who didn't know the A400 and didn't know Tom Evans and weren't confident in retaining the sound of this amp. Thanks Chris