The Audio Output Signal is very weak and distorted. The Buil-In Speakers work ok. Whatcould be the problem???

Hello,
I spilled some liquid on my desk close to the Laptop. I proceeded immidiately to remove the MacBook Pro from the spillage site and dried the outside. The MacBook was not in use at the time and the lid was closed. Two hours later my wife used the computer and initially it functioned alright, however, after about 20 minutes it all of a sudden died and could not be re-started. Later that evening I tried a few more times to re-start and was partially sucessful for a few seconds at the time. The next day I opened the Back Cover and noticed the dried residue of the spillage on the battery cover as well as on the motherboard.
I proceeded very cautiously to remove the stains and followed up with a hairdryer to remove any possible residue of moisture.
After that, the MacBook Pro funtioned normally again, with the exception that the analogue audio output no longer supports an earphone, or any outside audio amplifier or TV set. I must add that there is some presence of audio when I increase the volume setting to high, but the bass sounds are very distorted.
My question is, do I have to exchange the "Motherboard" in order to resolve this problem?
I would very much appreciate any suggestions you may have!
Regards,
Hank

Take it back to whoever "fixed" it. Apple won't touch it now.

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The Audio Output Signal is very weak and distorted. The Buil-In Speakers work ok. Whatcould be the problem???

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