2017 Seneca 37TS Furnace problems

[Oma/opa]

2nd part of my frustrating camping trip.
While it was not going to be super cold, I thought it best to test the propane furnace.
I always remove the circuit board prior to washing the MH since I have gotten it wet more than once. I reinstalled the board the day before we left on our trip. Was a rainy and wet drive and overnight rain was heavy. Anyway, next day tried the furnace and NOTHING. Go out and guess what..wet circuit board. Can't imagine the water came from the vents so maybe the evaporating drip pan from the fridge drain overflowed??? Another possibility is that my refrigerator vents don't fit very good(seem to be too big for framed openings(don't know how this is possible but ). Anyway, dried the circuit board, reinstalled and fired up the furnace. It tried but would not stay going. Finally after tinkering with the sail switch I got it going.
So, two questions..where did the water come from??? and does anybody else have poorly fitting refrigerator vent covers?

 

[RVermont]

My covers are tight. I have only had a problem when I accidentally allowed some water to drip when i was winterizing the ice maker. The water worked its way down to the circuit board below it. I tried to recaulk the area but jayco had slopped so much caulk in there I could not get it sealed to a level I trust. I am going to try using a spray sealant which should flow and seal those remaining gaps.