Mario,
sorry, I've never opened a PSR2000. It seems the PSR keyboards are harder to get into than the pro keyboards. there is more room and heavier parts inside the more expensive models and to keep things light, it's harder to work on.
George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)