As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUSELAGE SKIN LAP JOINTS CRACKED. JOINTS WERE LOCATED AT STRINGER 4R BETWEEN BS 480 AND BS 720B AND AT STRINGER 26L BETWEEN STN 560 AND STN 580. FOUND DURING MEDIUM FREQUENCY EDDY CURRENT (MFEC) INSPECTION IAW AD/B727/160 AND SB727-53AO222.