Hi - as topic, my 9110bt (VAG version of 910 I believe) is only outputting properly on the left channel (not amped, stock speakers)

 

Occasionally it flips back to normal but never for long. I've had the head out, checked and wiggled connections but to no avail. Problem is present on all sources.

 

Gutted as can't afford to replace right now - is it buggered or could I have missed something? Fixable or okay run through the RCAs? Sorry for all the questions...