It sounds like the bottom microphone might not be functioning properly after the screen replacement. Here are a few things to check:
1. Check for Obstructions – Make sure there’s no dust, debris, or adhesive (like from a screen gasket or epoxy) blocking the bottom microphone hole.
2. Inspect the Microphone Flex Cable – The Pixel 7 Pro’s bottom mic is part of a flex cable that could have been accidentally disconnected, damaged, or not seated properly during the repair. Try reseating the connector.
3. Test in Safe Mode – Booting into Safe Mode can rule out any software issues. If it works in Safe Mode, a third-party app might be interfering.
4. Check Sound Settings – Go to Settings > Sound & Vibration > Microphone to see if there’s anything unusual.
5. Try a Factory Reset – If the issue is software-related, a reset could fix it. Just make sure to back up data first.
6. Replace the Mic – If none of the above works, the microphone itself may be damaged and might need replacement.