probably where water drains out

 

Would bet NOT missing plugs. You want any condensation to drain out. You want to have that area properly fogged-in with full coverage of a creeping, liquidy cavity wax... and for it to drain out of those holes when first applied.

 

Thanks, I wasn't thinking of it that way.

 

i would sand away that rust and use some touchup paint or rustoleum

 

Thanks. I bought rust converter (bonds with & turns rust into a primed srface)