As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FRAME CRACKED AT STATION 400 BETWEEN STRINGER 8R & STRINGER 9R IN CABIN, 1" CRACK CONFIRMED WITH MFEC AT AIR CONDITIONING BRACKET INBD RIVET. HIDDEN CRACK ALSO FOUND RUNNING INTO INBD RADIUS OF FRAME FOUND WITH HFEC ON INSPECTION. REPAIRED FRAME AT STATION 400 BETWEEN STRINGER 8R & STRINGER 9R IAW EA 5310-04716 REF F FIG 3.