The FRA rules require the boiler be inspected every 1472 days of operation or 15 years which ever come first so there is no way this overhaul will last 30 year. Especially if it gets maintained the way it has been. It wasn't due its 15 year inspection until 2019. The boiler on annual inspection was found to be so clogged they had to do the overhaul 5 years early.
I might have heard wrong but I think the point Ed was trying to make was that his goal was to repair or replace any part that shows any signs of wear, rust etc to avoid having to make unscheduled repairs prior to the mandatory FRA mandate. So far it appears that is what they are doing. Time will tell if it was worth the extra effort.