Nuclear weapons are constantly being refurbished.. I live about 15 miles from the Y-12 plant in Oak Ridge and that's what they do there......24/7/365. Atomic activity is constantly present in such weapons and if not upgraded periodically they become useless.
Refurbished yes, MODERNIZED no.
I have a 1966 Pontiac GTO I've had since I bought it in 1970 for $1,500. Over the decades I have replaced a lot of parts. About 2005 I totally refurbished the car with an off frame restoration. I stiffened the frame, had the engine rebuilt by a company that rebuilds engines for NASCAR. It was bored out from 389 to 421, full race cam, increased compression ratio and lots more. LOTS of other fun things.
Bottom line, it IS a 1966 Goat which is refurbished. It has lots of carburetors but no computer controlled fuel injection, there is no six, eight or ten speed electronically controlled transmission, no camera's everywhere, quite some years ago I did replace the drum brakes with discs, I did that myself. They don't automatically brake when something stops in front or in the back of me if I'm backing up. The windshield wipers don't come on by themselves nor do the headlights dim by themselves.
So while it is refurbished, it certainly is NOT modernized.