You sound like you want to make this a DIY project. You'll need tools, a multi-meter (maybe) patience and above all time.
Ok, So you will need to get to part 10 and examine them if you want to check out those famous dogs. Don't rush into these!
We would first look at the coupler again before tearing into those. We do see the coupler go more often than the dogs (and the fact that you did not see the plastic pieces is not the "gold test" on checking it).
I have uploaded a copy of the repair manual. Your model may have some different items and features. However, the parts you are going to check and the basic mechanics are the same and you should follow the procedures.
When you go to the site to download do not use AOL. Use Internet Explorer or another browser because that site does not like AOL. Choose the "Free" option. After you download the file you will need to open it with Adobe or another application. You should already have that on your computer.
Sometimes, the site is a little glitchy. If you have difficulty, clean your temporary files and your hard drive, restart the computer and try again. It's definitely worth it to have the right information. You can go to the top right corner and save the PDF file to your desktop for easy access.
Please click here - washer
Let me know if you would like more information or clarification.