Welcome to our forum.
If it were me, I would probably call and them and ask them to bring my chemicals and pay the $40.00 for the repair. If you run into any problems, you will end up having them come anyway. It would be such a relief for you to know it will be properly repaired rather than worry about how to do it yourself..That's just me, but for $40, I think the peace of mind might be worth it. My dealer has always been more than happy to bring my chemicals along whenever he has had to do anything to my tub.Good luck
The #1 cause (at least in my experience) for the Moto not going up and down is simply dirty filters and/or the main diverter valve or comfort control valves not seated or open all the way.