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You can see the spring shaft if you get a short step ladder, get someone to operate the switch and watch with a flashlight, if the spring shaft is turning on the electric motor end and still turning on the gearbox end then it is the gears that are done. I expect if it is moving slightly then the gears are likely toast.
You can likely get it to move by assisting it with your strength while someone operates the switch...
Good luck
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