A few times recently I have heard a percussive, repeating jack-hammering type sound when the air suspension compressor is running on my 2012. No codes or suspension performance issues, just a loud sound that shows up periodically. Only pattern is that I notice it mostly when temps are near or below freezing. Today I dropped the rock slider (which has a beefy compressor protector welded onto it from the previous owner) to investigate and found a lot of road grime and crushed gravel (Northern California winter roads) resting on the protector, below the compressor. My theory is that the compressor vibration dampening “feet” were hitting the accumulated dirt, and making a particularly loud racket when that dirt-sludge is frozen. Does that seem like a plausible explanation? Looking at the compressor, the feet protrude well below the mounting plate - is this normal? Picture attached. Wondering if my aging compressor could be exacerbating the problem... starting to sense a compressor and air strut binge as I near 125k miles since I want this thing to remain on the road for a long time. That said, if refreshing those dampening springs would help, I’m fine riding this compressor out a little while longer. I believe my truck is in the “old-design AMK” / compressor TSB group, fwiw. Thanks for any thoughts.