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Marv ,
you are correct that you must remove the AN fitting to disassemble
the cylinders, they are simple and straight forward. I had to repair
all three of mine due to internal leaks , the problem was not the
"O" ring on the piston , it was the mating surface on the nut that
held the piston on the rod , it was not seating properly with the
washer combination "O" ring . It was easily resurfaced on a flat
surface and a sheet of 320 wet or dry. this stopped all of my
hydraulic hiccups. Fred this may be part of your problem too.

Billy H. 360BH