As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT PYLON AFT BULKHEAD HOLE NR 4 ON AFT FACE HAS A CRACK INDICATION IN THE ALUMINUM LAYER AT APPROX THE 2:00 O CLOCK POSITION. ENLARGED FASTENER HOLE IN THE ALUMINUM BULKHEAD ONLY TO 0.650 & INSTALLED ALUMINUM FREEZE PLUG & REAMED TO 0.4995. INSTALLED NEW FASTENER WITH RETENTION WASHER IAW EA 253355.