28psi is too low for sure. And I've had bad/worn air hoses damage the air valve stem core to the point that it leaked air badly.
Check the tire for any foregn object damage (nails, screws, etc.). If OK go to another air source and make sure to APPLY ENOUGH FORCE while adding air to get a good seal. Use your air gage to set the pressure to 38lbs. You will likely need to reset the TPMS per the manual. Drive it and check air pressure daily to determine if there is a slow air leak.
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