The spray arm would fall off during the washing cycle.

Repair was simple. I unscrewed the old grommet which held the old spray arm and screwed-on the new one. About 30 seconds was required. Other people having this problem should note that the spray-arm is made of three pieces which are inseparable when the arm is new. The arm is sold in this form. However, when your machine is having the problem that the arm falls off, the three pieces become separate. When you want to replace the spray arm, only one new part needs to be ordered because this part encompases all three components.