I spoke to my dealer on Thursday and mentioned I had pushed it in as hard as I could, literally brute force, then hoped it had solved it. It still did the same thing...so I'm guessing when they tested the lead was resting on the back of a cab and was fine because of that support. I tried all ways if getting it to work but still the slightest nudge and it disconnected.
I just can't risk this happening at a gig, plus the pop through the cab wasn't so great. My LM3 I sold for this never did anything like that, so I'm guessing you can see why I'm a bit nervous about it, The main thing I noticed was the housing for the power cord/power switch moved in the chassis, and the other UK owners I spoke to didn't have this.
My dealer stated it is being replaced still, is this correct?