Boeing 787 Trent 1000 Parts Subject To New Airworthiness Directive

The European Union Aviation Safety Agency (EASA) has issued an airworthiness directive (A.D.) for the Rolls-Royce Trent 1000 engine. The powerplant is one of the two options for the Boeing 787 family aircraft and has seen its fair share of problems in the past. So whats the problem this time?