| Sticking
Multiple applications of WD-40 worked for me. I kept spraying it as far back as I could get the nozzle extension and then worked the doors back and forth.
After application 3 or 4 I finally made a lot of headway.
Each application took about 15 minutes, but generous soaking with WD-40 and repeated working back and forth have left all of the tambours operational.
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