Ryan And I drove to EX and TJ drove to EY. 
Ryan and I turned off the HEPI VFD power supply then turned it Back on.
Then hit the reset button. 
The Pump then Whirled back to life !!! 
Then H1:HPI-PUMP_EX_PRESS_HIGH Flashed  Bright red for less than a second and the Interlock turned red and and the Whirling sound died.
Welp that didn't work.

We then ensured the setpoint:  H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_INPUT was set to 70.
Tried it again with H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_MODE set to manual. But we ramped H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT_TWEAK_REQ too fast(?) and H1:HPI-PUMP_EX_DIFF_PRESS_PSI  went too high and the interlock tripped again.
...
Then we tried a bunch of attempts to manually increase H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT to the value [2.29 V] that holds H1:HPI-PUMP_EX_DIFF_PRESS_PSI at 70 and Every time it would shoot well past 70 and trip the interlock again. 

We then opened up the control loop screen and noticed this integral term was set to 6. Which perhaps was too high.
So we hit the reset button.... H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_ITERM_RESET_REQ....
Thankfully that reset the Integral Term down to 0..... 

We then tried again to turn it all back on manually, and keep the H1:HPI-PUMP_EX_DIFF_PRESS_PSI at 70 PSI. Once H1:HPI-PUMP_EX_DIFF_PRESS_PSI was stable at 70 PSI we then switched over to auto. Now this Tanks the Output voltage that we just set to 2.29  ..... all the way down to 0.0...... ok...... then back up..... ok..... then over shoots to the moon, Again Tripping the interlock and shutting it down..... again. 
We tried using different H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT_TWEAK_SIZEs and otherwise tried to baby  poor lil HEPI  back into it's setpoints.... and it just wanted to FULL Send to the MOON!.

Then I had a weird thought... what if we set it too high? Will it go to 0? Will it go to negative Moon?! IDK but I wanted to find out. 

Really what I truly wanted was for H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_ITERM to simply go to the 2.28 value that allows H1:HPI-PUMP_EX_RMT_PRESS_PUMP_CTRL_OUTPUT  to be 2.28 Volts which keeps the Diff pressure H1:HPI-PUMP_EX_DIFF_PRESS_PSI @ 70 PSI. But for some reason I cannot change that value Integral Value at all. Or atleast I couldn't directly....

So this is what I did: 
I set the output voltage a bit High....  such that the Differential pressure was just a lil too high. This is to convice the control loop to go down instead of Up. 
I then reset the Integral Term so it starts at zero when we switch it from manual mode to auto mode. 
Then I hit auto.... the Output voltage drops to 0 and comes back up.... but.... this time I'm ready! .....  I'm waiting to switch it back to Manual mode Right AFTER the output votage PASSES the output voltage that I want . This has now set both the Differential pressure, Output voltage, AND the Integral Value ABOVE  my desired destination. I let it settle a little high. THEN I clicked Auto again, which finally allowed the control loop to stablize at 70 PSI. 
We were on the phone with TJ at EY and that worked for EY as well.
Then we watched it for a bit and drove back to the corner station. 
Shoutout to Ryan S. and TJ for showing me the ropes and pointing things out that that helped me jump to my conclusions. 

TLDR: The Control loop overshoots when approaching from below. Approach it from above. It works for both End stations. ¯\_(ツ)_/¯