As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 517 - KPDX-KPIA - ON GEAR RETRACTION OUT OF KPDX, GEAR UNSAFE LIGHT AND RT ALTERNATE GEAR WARNING LIGHT CAME ON. ACCOMPLISHED QRH AND RETURNED TO KPDX. FOUND BOGIE UNLOCK SWIVEL ARM SHEARED. S/D - MAINTENANCE REMOVED AND REPLACED THE BOGIE PIVOT ARM IAW MM 32-11-61. AN OPERATIONAL CHECK WAS GOOD.