As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJO - DURING Q-CHECK, FOUND THE PASSENGER CABIN FLOOR SUPPORT STIFFENER AT BS 294.5 TO BS 312 LBL 11 WL 208.5 WITH CORROSION OUT OF LIMITS. L = 4.00 INCHES. W = 1.00 INCH. D = 0.040 INCH. REPLACED THE PASSENGER CABIN FLOOR SUPPORT STIFFENER AT BS 294.5 TO BS 312 LBL 11 WL 208.5 IAW BOEING SRM 50-10-1 PAGE 8. (X)