Update: Resolved.
Fitted new heating element and pressure sensor.
However, it still blinked the LEDs and was silent upon active door shut, proceeded to pop open door after 2 mins.
So, the pdfs you sent mentioned blinking LEDs on demo mode. It was in demo mode. Customer must have accidentally activated it.
Done the into-demo-mode sequence (which took it out of demo mode) and all worked fine.
Massive thanks for your help on this one. Would never have been able to complete repair without that specific info.
Have a great week, cheers