Very Small Leak in power compartment

[E-man]

Hello Everyone,

Okay now that we are back from our trip I had a chance to examine the Transfer Switch issue and it appears that it was caused by a very very small leak from the sink in the rear bathroom.

In the power cabinet where the transfer switch is I noticed that the water was cloudy like the water that drains from the sink. I also noticed that a paper towel that I left there was soaked and the transfer switch box itself had water in it but not that much. Now I know it doesn't take much but I ran the water in the same sink for 30 seconds last night and no leaks nor was the new paper towel I left had any water.

After taking the transfer switch box off I noticed that the silicon that was used above to fill the wire holes that come into the transfer box were very loose and that is most likely where the water is coming from.

So after fixing the transfer box and sealing the opening with some RTV I will have 2 of my 3 problems resolved, but how would I trouble shoot the leak? We only used the one above the small hamper.