@nprofile1q... I'm pretty sure the last unsolicited call I got from work was when the low-oxygen alarm in the mechanical room went off at like 5:30am when one lab tech was the only guy in the building.

Luckily it turned out to be the sensor hitting end-of-life and bricking itself rather than going out of calibration (because apparently this sensor had slipped through the cracks and not got the regular maintenance it was supposed to), not an actual N2/Ar leak.