What was found
AT 253 KTS INDICATED ON APPROACH, THE LT AND RT MAIN GEAR DOORS ILLUMINATED FOR 2 SEC. GEAR HANDLE ALSO ILLUMINATED AT THE SAME TIME . THERE WAS A TRANSIENT GEAR UNSAFE LIGHT THAT ALSO ILLUMINATED BUT ONLY FOR A MOMENT, NOT SURE WHICH GEAR. COMPLIED WITH EMERGENCY CHECKLIST. LANDING UNEVENTFUL. FERRIED TO PDX FOR REPAIRS. REMOVED AND REPLACED LT AND RT MLG DOOR MECHANISMS IAW AMM TASKS 32-31-31-000-801 AND 32-31-31-400-801. PERFORMED FIM TASK 32-73-33-810-802 AND 32-73-34-810-810. OPERATIONAL TEST OF MLG EXTENSION & RETRACTION SYSTEM COMPLIED WITH. NO FAULTS NOTED. RETURNED TO SERVICE.