As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STA 520 HAS DAMAGE ON THE FLOORBEAM, 1.5 CRACK ON BOTH THE LEFT INBD AND RT INBD SEAT TRACK LOCATION. BOTH THE CRACKS ARE IN THE RADIUS AND EXTEND INBD AND OUTBD. THIS IS A GROUP 3 A/C PER S/B 737-53-1120, REV 1. INSPECT FOR CRACKS, REPAIR SIMILAR TO S/B 737-53-1120, REV 1.