My son decide to change the trim oil in hyd. unit and removed both plugs on the side to drain. The one has a spool valve with o-rings on it a couple of ruwashers with o-rings on them and a metal disc, I have put them back in rubber washer, disc then other washer. The other port has a check ball, pin and spring, and then a disc with an o-ring Im not sure how they came out, have tried different ways but it still doesn't work, is there a schematic available for this unit or has anyone suffered a similar fate. Suzuki DT55 outboard, power trim unit is a Shinko.