another thing has added to the faulty list, apparently my headlamps don't want level any more?

I understand that the ECU can suffer from damp due it's position in the footwell so have ordered a new one hoping that it will sort the issue but, does anyone know if they are just plug un play or will I need to do something clever with diagnostics?

Having been struggling to resolve an issue with the air suspension and noting that the headlamp levelling ECU has inputs from the height sensors is it possible that a faulty headlamp ECU could have an effect on the suspension as they all talk on the same network?

Ideas....