The zeroing out is to change the originally set "level" if you want "level" to be different. Popping is a problem often reported, particularly during temperature changes. For some of us it went away on it's own and was probably just remaining air bubbles in the system. Lippert has advised adding a type of motorcycle fork oil to deal with the problem. There have been several threads on this if you check the search function. Hope this helps.
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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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