The Arrius engine had a service bulletin a while back for missing dampers on the power turbine. The dampers stop vibration of the blades in the turbine wheel. In the incident that precipitated the service bulletin, there was an uncontained release of turbine blades (on the ground in that case). That type of engine failure could lead to a fire.
There have also been 2 previous in flight uncontained engine failures on EC135 but both were on P1 variants due to inadvertant entry into manual mode and subsequent overspeeds. That particular failure mode is not possible on the T1.