I can help
I did some trouble shooting and have provided the diagram below. That way you don't have to worry about getting to the wire colors. I just watched your videos. Looks like the Up/Down motor is frozen but the Left/Right motors is functioning perfectly. I did several rounds of contact cleaner hoping my motors would free up. I was able to move the motor in a downward motion with more than average force but when I went to pull up on the gimble the teeth on the gimble gear track start breaking off. GRRRR!