edricketts, don't take the delrin cover off yet. I wouldn't take it off unless I just had to. It screws into the aluminum body of the REO at the back, and it's easy to strip it, and it's not an easy fix. Ride it out a little bit. Take your RM2 off and wipe it down, maybe blow it out....blow down through the feed hole and up through the center pin. Clean it up and dry it off, swab out the catch cup so it's nice and clean. Put your o-ring in the catch cup.....essentially start over with everything dry....then check it periodically.
Is it just in one little spot on the right side between the magnet and the edge (that's all I can see in the picture) or does it go all the way across the top, covering both magnets? When my Reomizer leaks, I just sort of wipe around it, or wipe the air hole off with my finger and don't think much about it. But sometimes some juice has dripped down in between the door and the body, and I don't think to look there....so I don't wipe it. Then when I do open the door....there's juice all across that area. I wipe it off, and wipe the door off, then it's fine.
Is it vaping okay? If it is, then just sorta let this play out a little longer. Don't worry too much about it, and don't dismantle the REO yet. We'll all walk through every step with you until we get it figured out. Even if there is something wrong, there's ALWAYS a fix.