How to clean grinder chute disk on Breville YouBrew 600XL?

How to clean grinder chute disk on Breville YouBrew 600XL? Can the rotating disk on the Breville YouBrew 600XL coffee grinder-brewer be removed and cleaned? This model has a rotating disk that blocks or opens the chute from the grinder into the grounds basket. After years of use, the disk on my unit turns fitfully, after a delay, or not at all. Any suggestions?
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