As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - BOTH MAIN LANDING GEAR CYCLED AT APPROX 20,000 FEET AND 280 KTS. PERFORMED ALT GEAR EXTENSION CHECKLIST. ALT GEAR EXTENSION WAS SUCCESSFUL. LANDED WITHOUT INCIDENT. TOWED TO GATE. FERRY TO PDX. ADJUSTED LGDRCL AND RGDRCL PROX SENSOR. REPLACED LT MLG AFT DOORS LINK MECHANISM. C/W OPERATIONAL TEST OF THE LG EXT AND RET. OPS TEST GOOD. NO OTHER DEFECTS NOTED. CHECK FLIGHT GOOD. RETURNED TO SERVICE.