As promised, i was cleaning/draining and found some pretty nasty looking fluid on the inside of the elbows at the reactor so I took it apart to see if everything was alright.
7x7x2.125" reactor
+nnnnn- configuration
neutrals are 5"x5.25", held in place by 1/4" gasket strips on the edges, see photos. active area is 4.75"x5", but the plates are flooded at all times.
bolts on the back were not tight at all, more than finger tight but I only needed to have the socket in my hand to take everything apart. Plates look to be very lightly sanded in a circular motion, no consistent sanding was seen on any of the plates.
I'll be hitting them hard with 40 grit sandpaper in both diagonal/horizontal/vertical directions before putting it all through a cleaning and reconstruction.