I have freed up my broken tilt motor such that it now sends the wheel up and down very smoothly and easily. The telescopic motor is siezed and I'm happy to leave it that way having adjusted manually for my desired reach.
When turning ignition off, the wheel cheerfully swings up to the highest position, as designed. What's strange is that when switching on again, the wheel comes down about a third of the way, not all the way back to the memory. If I press the memory button, it'll come down a little more. Press it a third time and it'll come down to the stored position. Very strange that it won't run more than half a second or so downward on automatic.... but if I manually adjust it'll easily go top/bottom/top with no interruptions. On that basis I suspect control/measurement rather than motive power.
Is there a position sensor I should be examining, perhaps?