I have that problem with one Reo with the new 510. Mine appears to be worse than that. Mine leaks all over the top and down inside behind the delrin cover and even puddles in the bottom of my mod. I might actually have a bad 510. My other one works ok, and my non-modified one works the best! Go figure. If I can't figure out what's wrong, it might have to go to the spa.
I have the exact problem. I keep using my non upgraded REO it never leaks, my new 510 REO leaks a lot....I've had it apart many times and hubby found some things and we thought it was fixed but continues after a while to leak. It's been sitting in my spare room for a while now.....I just haven't gotten back in there to fool with it....I am thinking mine needs the spa also, even though it has always leaked.
Tracey