Browns Ferry - Repair suggestions for Pre-Action Supervisory Systems. Do you have them, how maintained, how repaired / find leaks?

Wolf Creek supplies service are through a regulator for supervisory air.  The system has a low pressure trouble alarm to indicated a leak.  Pressure gauge is monitored during monthly FP walkdowns.  

Wolf Creek supplies service are through a regulator for supervisory air.  The system has a low pressure trouble alarm to indicated a leak.  Pressure gauge is monitored during monthly FP walkdowns.