The engine oil systems are separate from each other and the MRGB.
Probably debris from the last overhaul.
Jim L has provided statistical data that shows two engines failing almost simultaneously is so remote a possibility as to be of almost no concern.
Except for common mode failures like fuel contamination. Max You might want to ask how well fuel QC / fuel system maintenance is done at your installation.
the 92 is designed to fly well on a single engine
Max Ae Cougar flying PC2e to reduce exposure to hitting the deck or sea when an engine fails during offshore take off?