O rings fail and pressure escapes along with a wide variety of other causes. Monthly and annual extinguisher checks is one of my jobs with Fish and Wildlife and they can go bad from one month to the next. Also wasps and other insects can plug the hoses, cheap plastic Chinese controls can come apart and employees can use them for all kinds of uses never dreamed of by the manufacturers.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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