Zanussi ZJD12191 Display not working?

Hi,
The On/Off button shows that power is getting to the washer/dryer as the orange indicator light becomes lit.

The rest of the display (green lights under Start/Pause, Spin and Drying buttons) and the overall cycle duration display show nothing and is not lit up.

The dryer has been playing up for a week or two with the drying cycle finishing way before the original time set.

Prior to the display not working, no error codes were seen. I have called 2 engineers and one suggested the PCB and the other suggested the Dryer Heater Element.

Any suggestions would be most welcome. The machine is about 7/8 years old.