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iPhone 6S Plus sound/voice/speaker issues

Replaced the logic board and the charge port in an iPhone 6S Plus. Now, I have no earpiece speaker or loudspeaker sound, Siri says she’s “having trouble hearing me,” so I’m assuming there’s a microphone issue, and the volume buttons work but only indicates on the screen when I press them that the MUTE setting is “off.” Also, proximity doesn’t work.

Need help determining what else might be defective on the phone that would need replacing. Thanks.

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