My 01 disco 2 is having issues with the passenger side fromt and rear door locks as well as the rear door. the only way to open the doors is manually. I leaning more towards a relay, but don't know where this is located. anybody have a solution?

 

put your hand next to the door latch and feel for the movement of the actuator when you hit the lock and unlock button. If it its bad you will feel some slight movement but no up or down motion. That means the motor is bad in teh actuator.