The ground-attack Tornados were expensive high-end NATO spec platforms and are gas guzzlers (well all seventies era jets can be, but these double engine platforms REALLY were).
The ground attack variants were optimized for low level supersonic missions, putting tremendous fatigue on the air-frames. I'd doubt if any of them will pass a 'c' or 'd' check once the are disassembled.
The swing wings will be another source of maintenance headaches.
The Tornado interceptor however had a different problem.
This is from wiki,
"Essentially they took a heavy air-frame optimized for low-level flight (Tornado ground attack version), with engines optimized for low-level flight, with a radar optimized for attacking ground targets from low-level flight, and attempted to turn it into an interceptor intended to attack bombers at medium and high altitudes.
Despite its ‘F’ designation, and the euphemistic ‘interim’ description, the F.Mk 2 did not have a functioning radar and lacked several other vital components for a modern fighter. The center of gravity issues caused by the absent radar were solved with a large chunk of concrete ballast satirically dubbed the ‘Blue Circle radar’ after a cement brand. Sometimes a heavy metal plate was substituted instead of the concrete chunk. Despite the Tornado’s terrible high altitude performance and poor agility, huge amounts of money and time led to the F.Mk 3 – which eventually matured into a capable weapon system.
So - long story short, bad design to start with, and refurbishing these would be a money-losing exercise.
