Yup, I am still new to this. After the CompassMot test, I was putting the props back where they started, and discovered the top motor on rear/black arm (#6) was wiggling. Screws still there. So I took the top/bottom motor assembly apart, got out the red threadlocker (previously used blue). It was a little too much of the red, and I noticed the motor wasn't turning as freely as the others. Took it apart, cleaned it up, motor seems better, maybe a little bit slower if you hand spin compared to the others.
Will put it together tomorrow, as we have a severe thunderstorm alert going on.
Hoping I don't need a replacement motor!