Remove The Heat Sink - Lenovo Legion 5 Series Hardware Maintenance Manual

Figure 12. Remove the memory shielding
Step 3. Open the buckles and then remove the memory.
Figure 13. Remove the memory
Go to
https://support.lenovo.com/partslookup
replacement parts:
Memory
Memory shielding

Remove the heat sink

Make sure the following FRU (or CRU) has been removed.
"Remove the lower case" on page 28
Step 1. Disconnect the battery pack cable from the system board.
Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.
Step 2. Loosen six screws and then remove the heat sink.
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Hardware Maintenance Manual
to look up the Lenovo part numbers of the following