I am getting my Laptop fixed/replaced and logged on to see my ledger holdings and delete the desktop app.
They can't do anything with your ledger desktop app if they don't have access to your ledger device, except in case if you made a mistake and left seed words on your disk in digital form.
I logged on to Binance the only other place I have any serious BTC on hold and it wasnt there.
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This is possible if you don't log out from websites and if you don't clean your browser history when you close it.
Sorry to say but this is not bitcoin technical support, you need to talk with the guys who ''fixed'' your laptop.