As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE LINE MAINTENANCE WALK INSPECTION, 2 CRACKS WERE NOTED IN 2 SEPARATE SKINS OF THE LT SIDE INNER BY PASS DUCT. BOTH CRACKS EMANATED FROM A DPI SWITCH ACCESS COVER DOUBLER RIVET AND PROPAGATED OUTWARD FROM THE DOI SWITCH CUT OUT AREA. BOTH SKINS, P/N 45-12500-19, -21 WERE REPLACED.