Good day, I bought a 3DR X8+ but haven't been able to fly it because motor A (back bottom left) isn't working. I have tested the ESC and the motor outside from the frame independently and it works perfectly, but when I put together the copter and do the motor test trough the Mission Planner it just gives a long beep and doesn't work. When I arm it, all the motors start spinning except from that one. It is labelled in the connection to the PCB as the No. 8. I have also tried using the ESC and motors from a different arm (using/changing other motor and ESC from the copter as the motor and ESC A) and still the same problem. What suggestions do you have? Is it a configuration problem in the Mission Planner of PX4? What should I try? Hoping for your help, Best regards, Juan Pablo G.