As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DISPLAYED DUTCH ROLL TENDENCIES AT FL330 AT .77 MACH. OSCILLATED 1-2 DEGREES LEFT AND RIGHT WITH 3-4 SECONDS INTERVALS, SKID INDICATOR MOVED APPROXIMATELY 1/8 LENGTH LEFT AND RIGHT. TROUBLESHOT THE SYSTEM IAW MM 22-22-01 AND 22-22-04. EVERYTHING CHECKS GOOD AT THIS TIME. COULD NOT DUPLICATE DISCREPANCY AT THIS TIME.