There isn't any adjustment on the lift assembly. I had P5 that had pretty much the same issue. I had to replace the the actuator in the assembly. It was pretty simple and not complicated at all. I ask of members pretty much same as you. I got responses from try a lubricant to lightly sanding the rod that goes up and down. If memory serves me correctly. I beleive the assembly cost around forty dollars and it took under thirty minutes to replace.
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