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I’ve owned our bus/mh for 11 yrs. WOW!I haven’t looked for aux system leaks in almost 10 yrs because the leak rate has been acceptable, until late this yr. So, I gone over most everything, found a lot of small leaks. I also found 2 larger leaks: a) the belt tensioner regulator, b) and the 3 way red handle valve next to the regulator. Now I have the aux system leak rate down to 10-20psi/hr which is acceptable to me.I haven’t replaced the 2 low level Norgrens in about 10 yrs, so they’re on my list. I did put a ballon on the one with the exhaust port and nothing was leaking.The 2 Liberty installed Norgren on the floor of the steer bay for their auto leveling system are on my list, Each has an exhaust port I’ll do the ballon trick too 🙂I’m tempted to do what Jon did/does and add ball valves and pressure gauges everywhere to isolate leaks and/or things.