Great video bus. Yes I had the same test results with the wheel motor vent lines. But I am curious that now you are getting 2100 lb to the gauge on the wheel Motors whereas before you were only getting 1400 pounds. Recall that I was getting 1,200 lb to the wheel motor gauge when wheel Motors engaged.
I have not yet had the time to try this, but this was suggested by TVA:
Disconnect and plug both of the hydraulic lines going to your high-speed cylinder, in your case, you have a high speed shift cylinder next to each wheel , which could indicate a possible leak of oil inside the cylinder seals. And see if that kicks up the pressure to your wheel Motors, which TVA previously suggested should be around 3,000 pounds. Also FYI, I recall seeing in the manual under troubleshooting low torque to the wheels that you should test the pressure with a 3000 pound gauge. While the manual did not actually say that the flow pressure should be at 3,000 lb, I can only assume that because they recommended a 3000 pound gauge that that should be the pressure like TVA said. And you should also unplug the wire to the 2 Speed Shift cylinder solenoid on the mini valve Bank.
If this does not kick up the pressure, TVA suggested just taking a pressure reading on a wheel motor line with the function engaged but all 4 wheel motor lines plugged after the gauge. If you got three thousand pounds or significantly higher, then this would indicate no leaks within the system before the wheel Motors, and that the leakage was in the wheel Motors, if I understand the test proposed by TVA.
Did you have both of your wheel Motors rebuilt?