Spent 14 hours chasing an air leak on a 2015 Freightliner, turned out to be a $12 o-ring

Last Tuesday in the shop I had a Cascadia that kept dropping air pressure overnight, and I tore apart the brake chambers, checked the dryer, even dunked the lines in soapy water twice before I found it. The culprit was a tiny o-ring inside the leveling valve under the frame, hidden behind a bracket I swore I checked. Anyone else had a gremlin like this where the fix was stupid cheap but the diagnostic time killed your whole day?

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