As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJO - DURING C-CHECK, ON THE EXTERIOR FUSELAGE BETWEEN BS 986 AND BS 1016, STRINGER 21L WAS FOUND WITH SEVERAL SMALL CRACKS. REPAIRED FUSELAGE NR 21 LEFT STRINGER SECTION BETWEEN BS 973 AND BS 1016 DUE TO CRACKS PER SRM 53-10-3, FIGURE 1. (M)