Hey Scott,
I had the same problem with my 2000. It's a poor design for heavy items. I ended up putting a sturdy music rack up behind the keyboard. At least it would then hold a book.
Good luck,
Zuki
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Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)