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The two biggest issues we see here on these systems are connections that get damp and battery issues. That includes cabless that need cleaning, especially to the chassis ground. Unplug the connections on the contol panel and control box and replug them in. Hopefully, this will cure that and please get back to me if you need more as all follow ups are included in our fee.
The level sensor box is mounted on the frame. I don't know where the control box is, but usually they are found in one of the storage bays. And no, I didn't get the video. Did you attach it to your post or e-mail it?
Use the paper clip icon to attach it to your post......or perhaps the paperclip as that is how I attach them to send them to the customers.
I suspect that you might want to have a mobile tech in your area come by and assist you. Most RV shops have a list of those who do that sort of work and the RV parks do as well.