Yes, I've cleaned the sensors. I'll weigh the MC and see what it says. I haven't unplugged the cord only turned the machine off and on.
Not as disastrous as I thought, I can borrow DDs TMX for demos.
The MC is weighing at 25 g, but when I weighed potatoes which should have weighed 420g, it read 120.
It seems to be about 25 - 30g out when comparing to my normal scales which weigh in 1g increments.
Just now weighing potatoes again and it's working properly! I'll still send it off at some stage, but not just now...