I've been curious about this one as well. I was looking at some maps and checking with Google Earth and I found a path off the 33. You can play around in the Mt. Pinos area for a bit but Lockwood Valley road is the best bet.
I was up there this past weekend and the Range informed me that most forest roads are still closed from the Heavy Winter.
The Road is called Matilija Canyon Rd, it's just south of Wheeler Springs off the 33 right outside of Ojai. I didn't get the chance to go check it out as I was with the kids in the truck, but judging by the amount of GeoCaches along the road, I'd say it's open. Looks like it breaks a little and then turns into Murietta Juncal Rd. Comes out near a resevior then onto many different available paths.
So the path would be Gorman or Fraiser Park to Lockwood Valley, Down the 33 to Matilija Canyon Rd, then East for as long as that dirt goes. I'd be willing to check it out this weekend and report back for you. Maybe even try to partner up?