I purchased a Sensah Empire groupset last fall.  Aluminum, not carbon.  Mounted it on an older bike.  The brifter for the rear derailuer is faulty.  It works but it won’t go through all the gears.  Refuses to go down to the last 4-3 gears.  I attempted to figure it out but it’s beyond my mechanical abilities.  No issues with the left brifter/FD. Anyone want the mini groupset (brifters, FD, RD) for spare parts its all in the original box (no cables).  50.00 shipped.