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What I have done in the past and usually this has to be done a few times during the repair is open it up to the point where it is partially open and holding then turn off the key and it will hold like this for a little time.It may slowly creep to a closed or opened position then you would need to either support it from closing or opening all of the way or repeat the steps with the key on open it partially to a point it holds (usually half way open) then turn off the key.The hydraulics will slowly relax and allow it to close or open when the key is off making it difficult to repair anything but with the key on the electronics usually cause it to open or close on its own after a short period of time.I have had some success with half way opening it and supporting it then doing the repair.
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This is what I have done in the past myself when doing top repairs.In some cases the warning will occur to let you know the top is open and may stop after a bit or may continue to beep.You can try and remove the key as well to see if the beeping then stops shortly after it is removed.I dont see any other procedure myself on keeping this open to do any repair work.