Dig around and find a service manual that suits your model. They are usually designed to be taken apart with very little room to work in, beyond that required to operate the machine. Top-loaders, for example, usually have catches hidden in the seam, that allow the top cover to pivot up just far enough to access screw heads hidden inside.
My front-loader was more complicated, as the seal had to be removed from the panel and there were a few screw heads hidden both under the seal and inside the door for the pump filter. But the whole front panel came off more or less vertically, and gave good access to the electronics boards and such.
In my case, it was showing an error code that indicated the pump was bad (so I didn't mess with the electronics). I couldn't find anything wrong with the pump; it ran fine on the bench and the impeller appeared to be in good condition. But, a new pump made the error code disappear and it's been working ever since.