How do diagnose RUMBA board not moving extruder motor

There comes the day a printer stops extruding and after a brief research I notice the extruder motor is not spining.

This is what I've found so far:

- X, Y, Z axis move flawless.
- Taking measurements on all the DRV potentiometers (green on the below image, X, Y, Z, E0, E1, E2 from right to left) and all of them get the same voltage.
- It's NOT a faulty motor. I temp placed it on the X axis and it just spins fine
- Wires are fine, all of them tested and motor was tested on X fine so wires are ok.
- In red the average volts I get by moving X, Y and Z back and forth
- In yellow the average volts I get when I try to extrude, no matter if I measure E0, E1 or E2
- Top left is the RUMBA pin assignment I'm currently using on Marlin 1.1RC7

So I need to know how to diagnose further, the drivers or whatever is causing this weird behaviour!
This is specially weird that only Ex are not working, specially E3, which I never used before! !??


So how do I proceed with troubleshooting this?!?


[i.imgur.com]





Thanks!