96 328ic top jams in cold temp

When the car has been sitting the sun, the top retracts ok.
Overnight or when the car has been parked in the shade a while, the
top will stick when trying to retract it. The plastic cover that sits over the top when retracted will rise up a few inches and stop.
This sounds like something needs to be lubed. Other than the obvious of looking at all the moving parts and lubing them, anyone got any ideas of exactly what parts need to be lubed?
Anyone have a link to a picture of the mechanism?
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