I had an issue with my from derailleur and took it into a bike shop where the guy told me nothing was wrong with it even though I was noticing some noise coming from it. I then tried velofix the bike service and they fixed it. I rode 50 miles outside and then put it on my trainer where it was working for a while. The next ride after that though the big gear up front stopped shifting down to the small gear as shown in this video:
My question now is do I attempt to take it to another shop? Take it off the trainer to see if I can get it to shift with my normal wheel? Should I mess with the limiting screws to fix this? What would you do? I can use it on my trainer in ERG mode without shifting gears, but that's not a long term solution. I am also wondering if it's my chain that could need replacing...
I am not an experienced bike mechanic, thanks.