I got word today from Chip at Power Steering Services, Inc that my gearbox is on the way back. He had tested the unit a few times with no issues and then on the 4th or 5th try it stuck. He decided to replace the complete valve/spool assembly and scrap the one in the gearbox. The new one tested great 12 times.
So the gearbox will be at my house tomorrow. Super fast turn around on fixing the issue. Complete turn-around took 1 week. He said he even threw me in some $$ to help cover my shipping costs.