As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE INSPECTION, A RIB IN THE RIGHT WING WAS FOUND TO BE CRACKED. RIB IN QUESTION IS BETWEEN MAIN WING SPAR AND WING AFT SPAR, 4TH RIB OUTBOARD FROM THE WING ROOT (WING STA 64.59). CRACK WAS DIFFICULT TO SEE DUE TO LACK OF INSPECTION PANELS IN VICINITY.