What was found
(CAN) DETAILS OF ENGINE MODEL, AND MEANS OF DISCOVERY UNKNOWN AT THIS TIME. ENGINE 125072 WAS REMOVED FROM SERVICE DUE TO A LOCKUP OF THE POWER TURBINE. PRELIMINARY INVESTIGATION OF THE POWER TURBINE REVEALED SEVERE DAMAGE AT THE POWER TURBINE ASSY (PT PACK). INVESTIGATION SHOWED 1 PT 1 BLADE FRACTURED. PRELIMINARY SEM ANALYSIS OF THE FRACTURE SURFACE INDICATES CASTING POROSITY IS LIKELY ORIGIN OF THE FAILURE.