Hello,
Two years ago I sent my radio back to Clarion for service. It was the cost of a new one, but I didn't need to do any re-wiring. They may still be there:
Clarion Service & Parts Centre UK
Pennyfields
Malmesbury Road
Leigh
Wiltshire
SN6 6RA
T: 01285 861861
F: 01285 860635
E: mail@clarion-service.co.uk
W: www.clarion-service.co.uk
Neil