Will Apple replace my MacBook Pro’s logic board if a third-party person repaired it?

I got some moisture damage on my M1 MacBook Pro that I bought last year (there’s a greenish spot on the logic board). A third-party local repair shop says that the moisture spot is in a place where the voltage difference isn’t very high and it can be repaired (for much less than the cost of replacing the entire board). My question is — if this person tries to repair it but it doesn’t work, can I still bring the MacBook Pro to Apple and ask them to replace the entire logic board with a brand new one? Can they just refuse to replace the board if they think it’s been touched by a third-party repair shop? I know my warranty gets voided, but outside the warranty, can the entire official Apple repair service get voided? Really nervous, so I’d appreciate a response a lot!