As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA- GEAR BROUGHT UP DURING DEPARTURE AND A LOUD RATTLE NOISE WAS HEARD IN THE COCKPIT. RED CAUTION LIGHT ON LEFT GEAR SELECTOR ILLUMINATED AND YELLOW CAUTION LIGHT ON NOSE DOOR AND RIGHT DOOR ILLUMINATED. FLIGHT ATTENDANT OBSERVED ALL THREE DOORS DOWN ON LEFT AND RIGHT MAIN GEAR. AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED PSEU. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE