As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AVIONICS COMPARTMENT LEFT SIDE AT FRAME 12 TO 12A AT FLOOR BOARD LEVEL, AREA HAS CORROSION APPROX 8 INCHES BY 8 INCHES ON RIBS AND STRINGER, STR 44L. REMOVED SKIN STIFFENER AT LT AVIONICS COMPARTMENT BETWEEN FR 12 AND 12A STR 44L IAW A310-200 DRAWING A536-10873. INSTALLED REPLACEMENT STIFFENER IAW A310-200 DRAWING A536-10873.