As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMING A DAILY ON A/C, NOTED TWO METAL TABS LYING ON ENG DECK. AFTER INQUIRING ABOUT THEM, FOUND OUT THAT THE CENTRIFUGAL COMPRESSOR COVER WAS CRACKING AROUND CIRCUMFERENCE AND RELEASING THESE TABS FROM COVER. THE BROKEN TABS FORTUNATELY BLEW OUT BLEED VALVE AND WERE NOT INJESTED THROUGH ENGINE