As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SJO - DURING C-CHECK, MFEC SKIN CRACK INDICATION, 2 INCHES LONG, ON UPPER ROW OF FASTENERS AT STRINGER 26L BETWEEN FROM BS 460 TO BS 464. REPAIRED SKIN FROM BS 455 TO BS 466 AND FROM STRINGERS 25L TO 27L IAW SRM 53-30-3 FIG 13 DETAIL II. (M)