As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INLET DUCT, CRACKED OUT AT NUTPLATE AT FORWARD MIDDLE SCREW OF DOOR PN 58-910028-17 THAT IS ATTACHED TO THE INLET DUCT. NOTE: BOTH LEFT AND RIGHT ENGINES INLET DUCTS BROKEN AT THE SAME TIME. THE CAUSE COULD BE VIBRATION INDUCED BY THE AIR STREAM. SUBMITTER RECOMMENDED ADDING A FOURTH SCREW FOR DOOR TO LESSEN VIBRATION. (X)