Starting from the bottom I would take both tanks out and do about a one foot drop (attitude adjustment) on a piece of wood.
The intent is to make sure the internal safety valve is working on each tank. Then put the curb side in and see if you can get it to work. Then the driver side.
The red regulator on the drive side is a flow control to prevent the long run to the switching regulator to cause the driver side tank to think there is an open line if the valve was opened too fast. If the safety valve in the tanks detects too fast a flow it shuts off.
Good luck.
Let us know what you find. Semper Fi.
Cheers,
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