Some comments:
1) Can't the beeper ringing be disabled on the configuration page by setting beeper to false?
2) On of my S3 miners has a temp of 0.
3) As a way to increase airflow, I removed the fan grills.
1) Yes in the "miner configuration" tab. At the bottom.
2) Temperature sensor may be faulty try restarting it. Do the fans throttle?
3) Taking out the fan grill won't make any noticeable difference and it protects the fans from getting damaged. Pushing cold air in. From my experience they run fine at low fan RPM stock. They shouldn't need modified if running at stock.