I purchased an older KHS aero comp last year. It was set for TT/Tri's so has the aero bars and end tube shifters. The bike is set up with all Ultegra 600 components. I have searched and searched and finally found some 600 level STI's (awesome). My question is: How do I know if they are in working condition? I have a shop probably 45 minutes away so just going by on a whim is difficult. What can I do myself to check them out and make sure they are good to go? Or am I going to just have to bite the bullet and go by?