At LLO, elevated 29-30Hz signal on ground sensors at EndY found the HVAC Fan Frame sitting on a rock.  I checked all I could at LHO and only found a couple things that if they were to move into the wrong spot, they could short out the springs.  I removed what I could and told bubba about what I could not.  Almost because I was unable to open the far west door in the south hallway at the corner station.