Hotpoint WD860P Trips Mains?

Hi,

My unit is around 5 years old and has had the usual issues with the dryer tripping the mains which is relatively simple to sort.

The current issue is that immediately I switch the unit on at the wall it trips the mains. I have disconnected the dryer and water heater elements but that makes no difference.

If I remove the lower plastic cover on the rear, there is a flash below the Kabil circuit as the mains trips. Any ideas?

Thank you in advance.
Shane