Sorry to answer in english, I can read french but don't risk to write it.
A friend of mine has a little electronics bussiness. He does these kind of things. He has repaired a few devices for me (communication-radios, cell-phones, a trimble control unit = rugged pda, battery-packs, ...). He's really cheap.
I live about 40km from Lille. You seem to be located in France, so it could be close, it could be far.
Chero.