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We have the older mechanical unit as opposed to the electrical-hydraulic unit. I've just overhauled my entire landing gear system and feel I'm getting a pretty good understanding of it. I think it was said earlier, but the power pack uses and electical actuated plunger to switch from gear to gear doors. It is easy to take off, it should be on "hand tight". If this unit is good, then the 28+ from the switches are not getting to the unit and would suspect one of your microswitches. My two cents.
I was told by a hydraulic shop, that these units should be overhauled every 1500 hours. Mine had 3000 hours on it. Still looked good, but as with ALL hydraulic assemblies they collect ALOT of very fine metal from the pump gears after that length of time. Might be a good idea just to open the top and check it out. You will have to drain the fluid in the resevoir first if you do.
Richard
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