I see it was refurbished in 2013...
gross - tons: 91000
refurbished: 2013 April -
Added: 66 new cabins (17 oceanview, 12 Interior, 37 AquaClass), new balconies for suites, basketball court upgrade, Apple PCs, retail store, WiFi, carpeting, new loungers.
I don't see anything about the engines or power plant. That's too bad, admittedly we have been getting some sadder reports about the Millie class of Celebrity ships.