No sound on GBA SP AGS 101?

I found that a GBA SP AGS 101 that I’d bought online was having some issues charging due to some corrosion in the charging port. I’d read that distilled white vinegar is good for cleaning corrosion, so I soaked the port in vinegar and scrubbed it clean.

Now the charging port works! But I’ve run into another separate issue. Now the speaker has decided to quit working!

I tested the speaker in another GBA SP and it works just fine. I tried cleaning the contact points on both the speaker and the board with 99% IPA, but I haven’t had any luck. I can hear a very slight sort of *thunk* sound when I power the system on, so I’m led to believe that it doesn’t have anything to do with the speaker making contact with the board.

I don’t have the slightest clue what might have gone wrong. Any ideas? Thanks in advance!