So my car is all buttoned back up and looks great. Driving for the first time and all new dash LEDs look and work great.

Give car a wash, and then drive it again - top Speedo LED is then dark and top Oil Pressure LED is dark. WTF?

Then I dry the car off, and this morning, all the LEDs work again...

Question: how/why is it possible that water or something affected those LEDs? where should I look for leaks? other thoughts?