As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - NOSE GEAR COMPLETED RETRACTION CYCLE WITH AN ALARMING THUMP, VERY LOUD AND CLEAR IN THE COCKPIT. RESHIMMED ACTUATOR BELLCRANK STOPS AND REPLACED STRIKER LINK RODS I/A/W MM. GEAR OPS CHECKED GOOD ON GEAR SWING. AIRCRAFT RETURNED TO SERVICE.