As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSIDE AVIONICS BAY AT DOOR SURROUND STRUCTURE. INTERCOSTAL AT STR 27L HAS CORROSION BETWEEN FS 364 TO FS 349.0. R & R LATCH PIN INTERCOSTAL LT SIDE OF STR 27 BETWEEN FS 349 AND FS 364 IAW SRM. PN SH670-32075-3, PERFORMED PRESSURE CHECK IAW AMM, CHECK GOOD.