As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LONGERON LOCATED IN THE FUSELAGE, BOTTOM LEFT, CRACKS AROUND THE NUTPLATES DUE TO STRESS FROM THE STEP. SUBMITTER SUGGESTS PREVENTION MAY BE A DOUBLER SLID UNDER THE CHANNEL RIVETED TO THE SKIN. THIS WILL PREVENT THE FLEX AROUND THE NUTPLATES WHERE CRACKS OCCUR.