Hocky, well at least it looks like some times they just fail and replacing the CAT without finding anything else wrong does not always mean that imminent repeat failure is going to occur. As you have had yours fitted for a while now, I think it would have shown up if any thing was going to cause a repeat failure. So perhaps I am just being paranoid! Any one else got experience of CATs breaking up for known or un-known reasons.

Marc c