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Gear problem
Start thinking about the engine driven pump.
Had very similar problems. All symptoms same as yours. Only think different was that I am not so brave to keep bringing the gear up and down like that. Like you, we started with the actuators, which were leaking and in desperate need of rebuild. After spending lots of money on that, and everything testing fine with the hand pump, we still had the same problem in the air. With no other alternative, my mechanic took off the engine driven pump. It was scrap metal, amazing it worked at all. It built enough pressure to drop the gear, but not enough to reliably bring it back up and close the gear doors. Got a rebuilt, changed the screen (screen was clogged with molten bits of the pump) and now it is fine.
Of course, there is always more to the story than what I can post here. In fact, my problem featured prominently in Don Nieser's presentation about O-2 maintenance at Oshkosh this year.
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