As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT WING SPAR LOWER BOLT BROKEN CAUSED BY MOISTURE SETTLING AROUND NUT AND THREADS AND CORRODING BOLT. CORROSION EVIDENT AT BREAK THROUGH 99 PERCENT OF BOLT DIAMETER. SUBMITTER STATES RECURRING PROBLEM ON OLDER AIRCRAFT. OPERATOR KNOWS OF MULTIPLE LIKE FAILURES. RECOMMEND TIME OR CALENDAR LEFT ON THESE BOLTS, 10,000 HRS OR 15 YEARS.