The two horizontal metal tubes which are attached to the housing and run back along the motor, or something else?
I had one on my first '83 GL1100A erode about halfway down the length of the tube at probably 90K on the bike. It started a slight drip. Both tubes and all rubber seals were replaced.
ETA:
The seals I mentioned are probably shot. In this case I believe they're actual O rings and not convoluted like the GL1100 parts were.
the two tubes from the heads that go into the back of the housing. The o-rings are of the triangle wedge variety. I have new ones in my spare parts box.
I think I just hit and move the tube slightly and that was why it was briefly leaking. The bolt that holds it to the block might be loose, going to check that also.