Bought my new Trek Pure 6 months ago and love it, ride 30 miles a day and have about 3k on the clock. Recently have started having problems with the Shimano 7 speed so took it to LBS for adjustment. Was ok for a while but now having trouble downshifting. Any ideas? While it is still under warranty, I need to learn how to adjust myself as LBS is 30 miles away. Have watched several videos but still pretty much in the dark as this is my first multi-speed bike.

TIA for any replies!

Also, anyone know if Trek still making the Pure? Could not find on the Trek website.