Is there a certian way that the lift cylinders on a 1985 302 v8 w/ OMC 800 outdrive need to be bled? I had the trim motor rebuilt and the marina tested the pump to insure that it holds pressure, now when I set the trim, the motor does not stay in that position very long. There is no fluid leaking out of the lines, the cylinder or the pump. So were is the pressure loss coming from?