Remove The I/O Board Brackets - Lenovo Chromebook Duet 3 Hardware Maintenance Manual

Figure 8. Remove speakers
Go to
https://support.lenovo.com/partslookup
replacement parts:
Speaker

Remove the I/O board brackets

Make sure the following FRUs (or CRUs) have been removed.
"Remove the LCD module" on page 26
Step 1. Remove four screws, and then remove the I/O board brackets.
Figure 9. Remove four screws and the I/O board brackets
30
Lenovo Chromebook Duet 3, IdeaPad Duet 3 Chromebook (11", 7), and Lenovo Duet Chromebook Education Edition Hardware
Maintenance Manual
to look up the Lenovo part numbers of the following