As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON LANDING WITH SPOILERS UNARMED AND THROTTLES AT REVERSE, HAD RIGHT ROLLING MOVEMENT ON ROLLOUT. TROUBLESHOT SPOILER SYSTEM COULD NOT FIND PROBLEMS. FLIGHT DATA RECORDED SHOWED LEFT ENGINE REVERSER DEPLOYED 5 SECONDS AFTER THE RIGHT REVERSER DEPLOYED, THIS CAUSED THE RIGHT ROLLING MOVEMENT. THE LEFT EEC WAS REPLACED, REVERSER DEPLOYMENT NORMAL.