Here's a snap of the guts you're interested in. The good news is you have high end flow so it is likely the main pump (not visible) is operational. Check for leaks and blue stains of course. there is an o-ring in that mixture shaft bushing (left side of picture) that failed in mine and leaked all over during flight. There's not much more that can go wrong from my perspective.
The low idle is governed by the adjustment screw (removed) which presses against that black gasket and spring behind that gasket. The spring allows a poppet to regulate pressure. Easy to imagine the spring and gasket settlling in but that doesn't explain the 10-hour move. My non-expert opinion is to adjust the low idle if all else checks OK. I think it is typical to perform the SID at annual where these adjustments would be caught. If there was a leak or need for repair, you certainly don't need to exchange or overhaul at that nasty price, I got an excellent turn and cost thanks to Martin Induction online here and you get to keep your relatively new pump on the ES. I don't have fuel pressure readings on the Legacy so I would never catch that pressure drop unless the engine starting idling poorly.
Paul Legacy Calgary 
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