Are turbine engine reconditioned after severe FOD damage caused by bird strikes? I've just been watching a video of a 757 suffering a bird strike on take off. The pilots continue with their take off, declare a MAYDAY, shut the engine down and proceed to land without any issues.

Link to the video: https://www.youtube.com/watch?v=9KhZwsYtNDE

Are these engine reused after an event like this? Are they sent away to Rolls Royce, Pratt &amp; Whitney etc to be repaired? Or are they always deemed a complete write off and replaced with new?

Obviously turbine engines are highly balanced complex pieces of machinery so I can imagine once FOD has damaged this balancing the damage is pretty high.
The damage is assessed and then a determination is made whether or not its economical to repair the engine.  It will truly be taken on a case by case basis.  However, FOD damage to the engine doesn't automatically mean the engine will be scrapped, and I think you'd be surprised with the damage they can suffer and still remain in service after repair.