Well, looks like it happened to me. I started noticing what I thought was a spot on the left side ground near the front weel a few weeks ago. I had been mostly riding at night, so I didn't see much with a flashlight. The spot was oily, but mixed with other stuff and impossible to identify. So I cleaned it well and waited. Noticed it again last night, so today I went in for a good look. BOTH forks are leaking (32,600 miles, never touched). I took photos first, then I cleaned them lightly with paper towels and reassessed (and took another photo). At the front bottom of both tubes, it was not smooth. So I removed the reflectors and the bolts that held the fender for better access. I was unable to remove the stupid brake line retainer clips so I couldn't get the fender all the way off. I then moved to bug/tar remover spray on the towels and worked on it. Then I moved to a sharp piece of soft wood to try and scrape. And I soaked the wood in bug cleaner and scraped and scraped and worked on it until I finally gave up (then removed the bug cleaner and cleaned up everywhere the oil had leaked).
There are still some rough areas that feel like perhaps scratches or pits in the metal, only at the bottom inch or so of the front of each tube). Not willing to try anything more drastic at this point. Put fender back. Then started the bike and ran forward and stopped hard, several times. Each time, the top few inches of the tubes were coated in a very thin layer of clean fork oil. This is probably my fault for not realizing how important it must be to keep the tubes clean, ESPECIALLY in the barely accessible areas at the front near the bottom.
I am not sure how much oil I have lost.