I have attached a few pictures.
Take the side cover off and you will see it looks just like my pictures.
I am not a HP tech but I figured all this out with the help of Grafx Network. They couldn't send a tech out due to covid back then so I had to do it myself.
1) could be the pip sensor, the circular part in the 1 picture.
2) Could be the ISS board that my finger is pointing to. That is the picture of the bottom one and I also took a picture of the top as well.
3) Could be but doubtful it is the trailing cable mechanism.
That is in my experience. I was having an issue with Magenta and then Light cyan before that. I replaced the pip sensors and what had happened is a mouse had got in and peed and pooped on the board. so it sort of fried it.
Start with the pip. Note the ISS trays both have to come out together and do not lose the spring that they clip on to hold them in place. Mine shot off but I found it LOL. If you are halfway mechanical like me, you can do all this. Just be careful with the wire connectors on the boards.