At least without having to huff oxygen from a mask…

The 340 pressurization issue is fixed.

Turned out is was a sticking outflow valve.

Simple soap and water, some compressed air, and a tiny bit of LPS fixed it…which is good because there are none available and we could not find anyplace to buy a rebuilt one.

4.2 psi differential, a 9000 ft cabin at 25,000 ft. At that altitude we can go pretty fast and cover some ground if the winds are right.

The weather was gorgeous for a flight: Severe VFR, clear and smooth: The view out the windows on the test flight as we turned back north at FL22 (22,000 ft) was spectacular though.