clutch/slave cyl problem

I have a 2009 Santa Fe. I have read most of the information posted but it appears nobody has resolved the issue. My issues is the clutch pedal needs to be pumped in order for the pressure to build in order to shift. Before pumping it is at the floor to get it into gear and to up shift. The dealer has bleed the brake/clutch system and it works for a while but does not last. I realize the slave is located in the transmission. The braking system works just fine. The fluid level remains full and does not lower. Once pumped the clutch would just fine with no slippage and with no worn bearing sounds. It would be wonderful if someone has had a like problem that has solved the problem. The only thing I can think of is to replace the slave in the transmission. But before doing so, I would like to hear from the group

 

Don't have a manual transmission. So, no like experience.
However it does make sense to replace the clutch slave cylinder and/or the clutch master cylinder??
One or the other .. Or both are leaking.
Good luck