As the title suggests, mine is sick. There is a ticking noise (10-20 Hz?) when running - it sounds mechanical but isn't, unless it's the motor itself. I have been told this may be a fault on the Lingo, where one of the sine waves it generates drops out. Is this likely and how can I test it before spending £140 fixed price at Linn? Oh, just to rub salt in, I'm in France and they aren't easy to get serviced here.