Depends what you mean by dropped.....was it still in the stand? etc.
However as a minimum the engine needs to be declared unserviceable and RR tech services and your overhaul provider contacted.
After that it needs to be assessed, but I would expect a shop visit for the engine to be bulk stripped and the shafts, bearings and casings inspected and/or replaced.
Big bucks and an insurance job I'm afraid.
How did it happen?