What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Narrative: aircraft departed sea for london approx. 400 miles out started to dutch roll, jettisoned fuel and returned to sea, landed without incident. Pilot reported flight controls aircraft dutch rolling in cruise, suspect both yaw dampers. Pilot's aviation safety report: during initial climb, cruise and subsequent descent, aircraft suffered roll oscillation with autopilot engaged and manual flight. Aircraft diverted back to ksea. Initially aircraft required two units of left rudder to keep from rolling. Then with a/p engaged started a roll oscillation. All three auto pilots tried. Both yaw dampers individually selected off with no improvement. Aircraft flown manually and was difficult to control in roll. Dumped fuel and diverted back to sea, handling no better on final. Both yaw damper computers changed. Aircraft returned to service.
As the FAA filed it
NARRATIVE: AIRCRAFT DEPARTED SEA FOR LONDON APPROX. 400 MILES OUT STARTED TO DUTCH ROLL, JETTISONED FUEL AND RETURNED TO SEA, LANDED WITHOUT INCIDENT. PILOT REPORTED FLIGHT CONTROLS AIRCRAFT DUTCH ROLLING IN CRUISE, SUSPECT BOTH YAW DAMPERS. PILOT'S AVIATION SAFETY REPORT: DURING INITIAL CLIMB, CRUISE AND SUBSEQUENT DESCENT, AIRCRAFT SUFFERED ROLL OSCILLATION WITH AUTOPILOT ENGAGED AND MANUAL FLIGHT. AIRCRAFT DIVERTED BACK TO KSEA. INITIALLY AIRCRAFT REQUIRED TWO UNITS OF LEFT RUDDER TO KEEP FROM ROLLING. THEN WITH A/P ENGAGED STARTED A ROLL OSCILLATION. ALL THREE AUTO PILOTS TRIED. BOTH YAW DAMPERS INDIVIDUALLY SELECTED OFF WITH NO IMPROVEMENT. AIRCRAFT FLOWN MANUALLY AND WAS DIFFICULT TO CONTROL IN ROLL. DUMPED FUEL AND DIVERTED BACK TO SEA, HANDLING NO BETTER ON FINAL. BOTH YAW DAMPER COMPUTERS CHANGED. AIRCRAFT RETURNED TO SERVICE.