[360]

You're no fool to miss that. Just need a bit more experience as to what causes leaks in the air system. Believe me it was all new to me and to others when we started out fixing and repairing our Newells.
I've found over the years that when fixing one thing to look around for any other obvious or not so obvious problems. As you gain more experience these things will stand out. Being proactive is a good thing in these complex beasts.

The good news is my rear holds air I hate to say forever, but let's say I haven't seen it drop.  Front is not bad on compressor running as it was running maybe once every 5-6 hours when I was out last fall, but my front does drop over time.  Haven't really timed to see how long it takes them to drop, but I'd love to get them to stay up like the rear does.  Goals!  I need to build myself on of those handy little leak test tools.