Fixed! I had to make a tool with a 1/2" open end wrench and an extender to rotate the spring which moved the slotted bracket once I loosened it. I was then able to get a wrench on the adjusting bolt and then lock it back down. The trunk stays open now on its own. If I had taken the inside panels off, I would have had direct access to the hinges and I would't need the tool with an extender but I was trying to avoid doing that. Thanks.
