Most recommend replacing the master and slave as a must. I believe most places sell them together as a pair. When I did my clutch I only did the slave which is basically the throw out bearing and had no problems bleeding it etc. hard to say what clutch kit the shop used but most agree Luk are tops in quality. if your losing fluid which is brake fluid from the master/slave/TO bearing there is obviously a problem. Hopefully the shop makes good on it warranty wise. I did this on one of my bikes front brakes which I thought was a joke but it worked. I bled and bled and flushed the MC and calipers and could only get a bit of brakes at the very end of the lever stroke. I pumped them up best It would go and the duct taped the lever to the handle bars. Low and behold the next morn when I released the lever I had a firm and barely moving front brake lever. Guess at this point you have little to lose by pumping the clutch up for all it can get an take a 2x4 or something like that and hold the pedal to the floor and see if it bleeds out any air in the system. if you have a nice big puddle under the trans/bell housing then you know for sure the slave/TO is junked.