I had the Slave cylinder go out on me the other day but i was nowhere near a jeep dealer! I took it to a mechanic that works on jeeps and all he did was replace the slave and put new brake fluid in. Since then I have driven it for 2 days(about 500 miles) and off road about 15 miles, with no issues since the replacement.

Is the slave cylinder covered under the powertrain warranty?
Should worry about the clutch or anything else?

 

Mine has gone out 3 times now and no its not covered by the powertrain warranty.

 

It is, however, covered by the regular warranty as mine was. WOL did tell me that you can add brake fluid and drive to the dealership to get it fixed.