As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CAT III APPROACH & LANDING, AIRPLANE LANDED 15 FEET OFF CENTERLINE. NO INDICATIONS OBSERVED BY CREW DURING APPROACH THAT LATERAL GUIDANCE WAS INACCURATE. PERFORMED 1200 HOUR CAT III TEST IAW TC 6340001. ALL TESTS PASSED. ACFT REMAINS CATEGORY III QUALIFIED. COULD NOT DUPLICATE. RETURNED TO SERVICE. NO PARTS REPLACED.