As just about all of us have read here, certain models of WW trailers have defects that have resulted in a number of different problems. To one degree or another, this subject has come up on this for...
Update: First trip out since repair. I rewired the brakes and pulled the cheap "lamp cord" out of the axle tubes. Replaced with thicker insulation wire double jacketed. Ran it on the outside of the axle. My "Wiring Fault On Trailer" message on the dash has gone away. So far the wall is holding up, however, I have not driven it in the rain yet.