The hummimg you heard was likely the v arms trying to drive the control arms that move the clamshell and the top. To open up the clamshell at this point you will need to remove the rods to the clamshell. These are the big black arms that go between the v arm and the body colored clam shell arms. Pelican has a few good pictures along with the 101 Book. From there it is going to be straight up diagnostics.
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