Typical topside display when it has water built up inside due to leaking heater or condensation.
Symptoms: It will play with the controls on it's own, random digits & buttons won't work.
img4505 take away sticker from underneath topside shell, this will mean that water will escape from out of exit img4504.
Spray product from img4465 from previous post on both sides of topside circuit board, this gives it a glossy slippery surface which then means that water runs off it, down and out through the exit instead of building up and affecting controls.
Spraying on the screen from the inside of the PCU will also help it run down and away, instead of dropping onto the circuit board.
Even exit slates underneath the PCU will give it better ventilation and help clear any condensation.
We will soon find out if this sorts issue.