No, and I wouldn't expect to either. I've had a couple of leaky items before today, and they tend to be very secretive about it.
One is a rotary selector switch. Leaks from the top deck, but you won't measure anything in the manner you're proposing. Between one terminal and the frame you will though, about 5meg.
The circuit board was the same, the leaks are rarely (or so I'm reliably informed) on the surface, and consequently, not immediately apparent.
Out of curiosity, I broke open the phenolic board, and just like I was told to expect, no evidence of anything other than some phenolic resin. It's a sneaky thing.
As for fibreglass though, I wouldn't have expected it, but that's where the evidence is pointing. I have two tracks on a board. They are not physically connected. Current passes between. What would your diagnosis be?