As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL PREPARATIONS, FOUND BEHIND BOTH ENGINES THAT LOWER AFT NACELLES WERE CHAFING THROUGH WING SKIN JUST AFT OF FRONT SPAR FLANGE AND LEFT UNTREATED WOULD CHAFE INTO SPAR FLANGE. AIRCRAFT HAS 6,500 HOURS TTAF. NO LORD MOUNT DAMAGE, BUT SHOULD HAVE BEEN DESIGNED WITH AN ANTI-CHAFING STRIP.