If it were mine, I would pull up the plywood under the bed and observe the hydraulic ram when operating. It is possible you could have a broken pin or weld on the frame assembly. The red flag to me was the ability to run the slide in and out by hand. Worth a check. Good Luck!!
I agree with (bobsals) I would do what he said above.
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LARRY & LAVONNE HUMMEL
2018 3811MS
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