Put another way.
If its leaking your wasting energy from your plant.
If its leaking into an area were you dont want uncontrolled O2 at a certain time you could have clinical / operational issues.
If its giving more or less than it should do and you are aware of it and do nothing about it are you as Clinical Technologists responsible for any / all consequences of that leak?
If the manufacturer of any device says you should test it at set intervals and you dont, without authorised risk analysis to say why you havent how much are you as a Clinical Technologist responsible for?