As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING M-CHECK FOUND CABIN/HORSE SHOE DOUBLER CRACKED FWD SIDE OF STA 712 FRAME AT CUSP WEB. REMOVED CRACKED HORSESHOE DOUBLER AT STA 712 IAW DC9 51-305. DRILLED AND DEBURRED IAW DC-9 51-10-4. INSTALLED NEW HORSESHOE DOUBLER IAW DC-9 51-30-5.