They may need to send you to some sensitivity training.
I looked all over the Internet for a diagram of a power washer gun and could not find one. i looked at several brands and while they take apart everything on the main assembly they do not take apart the gun. My Guess is because the labor involved in taking it apart costs more than a new gun. It has nothing to do with the gender of the user or the skill of the repairer. If you pay somebody XX per hour and the cost of a part is about the same the company will probably replace. My question is why is this not under warranty? And for a DIYer who has no cost basis except their own time it would make sense to have a chart of how this is put together.