Its so hard to type this stuff. When I started out, the master was low. When it would no longer work, the master was empty. When I did a quickie bleed/fill to limp home, I was able to get pressure to drive, just still had air in the system, so it was dicey.
I do think the slave is leaking. The mechanic noticed it looked rough, said he could see signs of moisture, etc..
I know that you are correct that both should be replaced at this point.
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