What was found
PDX - UPON GEAR RETRACTION LEFT GEAR DOOR LIGHT AND LEFT GEAR UNSAFE LIGHT REMAINED ILLUMINATED FOR APPROX 20-30 SEC'S AFTER OTHER LIGHT EXTENSION LIGHTS WENT OUT. VISUALLY CONFIRMED GEAR UP. GEAR EXTENDED NORMALLY AT LANDING. C/W RIGGING OF LT MLG RETRACT ACTUATOR ROD END IAW AMM 32-31-11-830-801. OPS CHECK OF MLG PRIMARY EXTENSION AND RETRACTION, CHECKS GOOD IAW AMM 32-31-00-710-801. RETURNED TO SERVICE. NO PARTS REPLACED.