One can find a bunch of service tips on youtube.
I was just recently made aware that the people who created the service manuals for KYMCOUSA, cyclepedia, have posted many youtube videos.
You might find some help with your issue there.
I know that if you purchase a subscription, or manual, from cyclepedia - you can then post a service ticket with their techs for help with your issue. We've used it before when working on LIKE200i's. Kind of nice to have a skilled tech reply to a diy'er with accurate info
Stig