Lenovo ThinkBook Plus Gen 3 Hardware Maintenance Manual page 47

Figure 22. Disconnect the battery pack cable and remove the thermal mylar
Step 2. Remove the Wi-Fi PVC mylar. Disconnect the antennas from the Wi-Fi card. Remove two screws.
Then, remove the antenna module.
Figure 23. Disconnect the antennas, remove two screws and remove the antenna module
Screw specifications
M1.6 x L3
Go to https://support.lenovo.com/partslookup
replacement part:
Antenna module
Number of screws
2
to look up the Lenovo part numbers of the following
.
Chapter 4 Removing a FRU or CRU
41