Mike,
Thanks for the checks.
It looks like the inputs needed are there except for the potentiometer circuit.
EV100 will not close a directional contactor if it sees less than 2vdc on TB11-1 before the accellerator switch is closed.
If you verified the pos/neg inputs at the PCZ plug, and the pins on those two wires look OK, then you can assume the card has failed.
The OE dealer can get you the correct card by the serial number. It will need programmed and the OE is always a good bet especially for warranties.
The OE will not likely be able to program it without installing it on your truck.
Your local indy shop SHOULD be able to set up the card if they have a LX handset and have the documentation for the correct settings. It is worth asking imo.
You can buy a handset and do this yourself, but the cost of one probably exceeds calling out a tech.
We face the same scenario in the automotive world today. Parts need programmed, so we either buy a tool or let the shops program them.
The OE may provide you the settings if you buy a remanufacured card from them.
There are also companies such as Flight Systems who do offer repairs on electronics. They have access to schematics and functions/ flowchart diagrams on their site.
You may want to contact them and weigh sending your card in for repair if they still offer that service.