I have a 10512 that keeps on spilling dev, i have replaced all seals,replaced the dev, cleaned the mag rollers,adj the doc blade, and still it will not stop spilling dev .
Replacing the dev unit is not an opption even if it has done 7mill in 2years.
Stock up on vacuum filters and paper feed units because you're gonna need them. Parts wear out (including dev units) and they eventually have to be replaced.
Best of luck to you!
__________________________ We are what we repeatedly do. Excellence, therefore,
is not an act but a habit. -Aristotle
at some point refurbishing is not an option 
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