Yes, I'm afraid that's what the situation is on Karma. The screws penetrate through the cabin liner with plastic end caps on the inside. The nuts and washers are not on the outside of the cabin liner but are counter sunk so that they are secured to something between the cabin liner and the deck. When there is a leak it is coming from the under the screw and the leaking fluid contains something brown. Almost like a varnish when dried and stains the cabin liner.
Short Pump, VA
1981 O'Day 34
"No matter where you go, there you are."