Try this. Run it up from bottom with motor when it stops going up, cycle the button a couple of times you should hear a noise. Then manually lift to top lock in place. Remove plug and top off insert plug then try running it down. If it won’t go all the way down lower with bleed screw close then raise again as far as it will go with motor. Then cycle button down and up a couple more times then try raising as far as it will go with motor. If not to the top loosen bypas raise to top lock remove plug bleed and fill. Repeat this process. When you top off fluid and insert plug use the motor to try to raise off lock if it does come up then cycle it to the up position a couple of times for about 15 seconds. Let rest a couple of minutes to cool motor undo lock then try cycling down again.
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Charlie Weaver USN/ENC 1965-1979