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Sounds like the centric slave cylinder has failed or the bleed tube is not correctly fitted, see these have bad seals when new .
You do have the centric cylinder where you have to remove the transmission to replace this item .
as you said slave cylinder replaced
Sorry not come across this issue before ,but strange that this would happen.
Will open this back up so another jeep tech can check this out for you.
You are welcome . please hold by someone should answer you..