To add to the list so far -
(1) Rotor speed (N1 / N2 / N3) at zero following failure (siezed),
(2) Zero Oil Pressure when the engine is windmilling following failure,
(3) Heavy vibration preceding and following the failure,
(4) Heavy impact sound just preceding failure (bird strike or FOD ingestion),
(5) Failure following excessive EGT (Turbine melt-down),
(6) Excessive duct temperatures associated with the failure (something has come adrift).
(7) Any fire indication, which may be false, but damage must be assumed.
The list goes on.............
Regards,
Old Smokey