https://ledger.zendesk.com/hc/en-us/articles/115005198445-Are-my-coins-stored-on-my-Ledger-
Seems to suggest that the PIN and the 24 word seed is needed. so now im unsure again :/
a. the PIN code to access your already configured wallet.
or
b. the 24 words to reset and then restore the wallet.
I'm sure that you don't need the PIN because if you don't want to buy a new Ledger device, you can import your wallet in Electrum with the seed and without having to input any PIN.