As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C18 CHECK DISCOVERED .5 INCH LONG CRACK LOCATED AT STRINGER 16L, BS 348. REMOVED CRACKED CLIP IAW BOEING 737-300 SRM 51-40-02-06 FIG 8. FORMED AND INSTALLED CLIP AT BS 348, STRINGER 16L IAW AMERICA WEST AIRLINES ENGINEERING REQUEST NR 03-5311-05271-ES1.