As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON GEAR EXTENSION THE RT MLG SHOWED UNSAFE GEAR WAS CYCLED AGAIN AND RT MLG SHOWED UNSAFE INDICATION FOR 15 LONGER THAN THE MLG AND NOSE GEAR. REMOVED AND REPLACED THE RT MLG AFT UPLOCK ACTUATOR. A/C PASSED GEAR OPERATIONAL CHECKS.