1995 3000GT/SL Clutch problem
 

I have an issue with the clutch that is slowly allowing air into the system after bleeding. The master, slave and clutch assembly have all been replaced. It will initially be fine, but overnight air enters and the clutch is soft.

There's suspicion that the newly replaced Master cylinder is leaking; any recommendations on a source for a good replacement? Mitsubishi dealer is indicating OEM is no longer available.

Thanks,
Phil G.