I have the 1990s reissue with the Grey roof. If that's yours here is what I know. Take off the roof and look at the motor and cams that connect to the strings that pull the bin up. If the cams are spinning the bin should go down. It lowers by gravity so if the wheels are spinning and the string is letting out the bin should go down. If not its binding and it's a matter of figuring out what it's binding on.
Take both motor and gearbox assemblies apart, clean out all the old lubricant with naphtha, relubricate with a good quality grease, and reassemble.
Larry
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