Baumatic BDW45.1

Hi guys, a little help required if possible.

I have a problem with my Baumatic BDW45.1
It started by tripping an 80A RCD.
I gave it a restart (and everything else on a socket in the flat) and it did the same again.
This time, however, when I went to restart it, the display went haywire. If I pressed the time delay button or the wash type button, the lights would flick through all the options with a continuous beeping.
So I decided to have a peak under the bonnet. I took off the side panels and a couple other access panels and found nothing obviously wrong. No blackened terminals, no evidence of a water leak etc.
I gave it a rest that day and came back to it the next.
This time, it would indicate the temp but pressing the buttons didnt change anything.
I came back to it the next day and just once, as I turned it on at the power switch, it acted normally. However, I opened the lid, played about with it etc and it just went back to indicating the temp without letting me choose a wash cycle.
Any clues as to what may have initially tripped the RCD or the subsequent issues?
I’m a trained engineer myself, just dont know much about white goods & would prefer to fix things rather than just chuck it out.
Thanks in advance for any help, it would be gratefully received.