Welcome here... no replies yet in almost 24hrs so I'll try.
Time to get dirty... engine washing with a jetwash especially can lead to both short & long term problems.
You need to seek out every electrical connector under the bonnet that has had water driven into it & open it up, dry it out & apply an electrical cleaner until you can find no more to do... engine cleaning is not a good idea on any modern car without meticulous care & attention.