I had not wanted to talk about this until we had an answer, but our poor little JK has a dead engine. It's the 3.6 version which is meant to be the better of the engines they have used.
Turns out to be a stretched timing chain which has led to further problems. Stretched not broken, but must have slipped a cog or something.
Anyway, after plenty of to-and-fro FCA have accepted the claim and the engine is to be replaced. Big thumbs up to FCA I had been getting getting a bit nervous.
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