As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ROUTINE REPLACEMENT OF SEAT RAILS, THE FLOORBOARD WAS FOUND CRACKED AT THE AFT END OF THE RIGHT SEAT INBOARD SEAT RAIL. THE NEW AND OLD SEAT RAILS ARE NOT ROUNDED OFF AND HAVE SHARP EDGES WHICH MAY HAVE CONTRIBUTED TO THIS CRACKING PROBLEM. SUBMITTER RECOMMENDS DRESSING EDGES WITH FILE.