Macbook Pro (2021) with Apple Care and multiple repair reasons. How does the repair work?

I have a Macbook Pro 16" from 2021 with Apple Care Plus. A few weeks ago, (sticky) liquid spilled over the keyboard. All keys still work, but some get stuck when typing. The battery only has 83% of the design capacity left. Now I can claim Apple Care Plus in the event of liquid damage and apply for a repair with an additional payment of €259. My questions about this: - Would the complete lower part of the Macbook be replaced or actually just the keyboard? - Will the battery also be replaced during the repair and will it be back to 100% afterwards? - The SSD is fixed on the logic board. Will the Mabook be set to factory settings after the repair and will I have to restore a backup? - Has anyone here had similar experiences - how is the repair process going?