Our 2015/16 Bailey Unicorn Madrid was serviced last March 2020. And because of Covid has not been used. I’ve put it on a pitch today to use. Plugged in the power. All the electrics seem fine, fridge, microwave lights are all on. I’ve connected the aquaroll. But when I switch the pump power switch on, nothing happens. I’ve checked the dump water valve, checked pump connection. Have I forgotten the obvious? The only thing that springs to mind is the copper connection points on the outside, are not shinny clean, could that be the problem? Thanks in advance for your help. PS I appreciate the water pump is in the off position in the photo, but even when it fails to illuminate or pump water. No noise whatsoever.