Serial ce310743
Hi we have this BT with the 2 zapi ace2 controllers for traction throwing up error D1 I think with the zapi handset plugged in it says left encoder lock.

Customer has replaced left motor encoder twice to be sure. They have also replaced both traction units off another truck.

They have checked wiring from encoder back to both traction units and no break or earth in the wires.

They have also changed the logic card that sits under the floor plate towards the left side of e truck.
Now we are confused so if anyone could give us some pointers that would be really appreciated.

Regards