Do you know what has changed recently to make The Lilly Belle toast? Even a new boiler would still be much more feasible than replacing an entire loco. Please do not think I'm questioning your info or saying it's inaccurate, it's just somewhat surprising, especially given all the time and money they've already put into the refurbishment. I'm just very interested to hear more.
Barring a boiler explosion, I can't think of anything else that couldn't be fixed or replaced. The last info on The Lilly Belle I received, which was admittedly secondhand and at least two months old by now, was that Strasburg was about to begin work on the new boiler. If you can't share any more info to protect your source, I understand. Like I said, I'm just very interested.