As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEA - ON CLIMBOUT THROUGH 2700 FEET AT AROUND 270 KNOTS, THE MAIN GEAR RED UNSAFE LIGHTS CAME ON (AND GEAR HANDLE LIGHT) MOMENTARILY. PSEU CHECKED, RELATED CODES TO LANDING GEAR WERE RT MLG UPLK UNREASON FAR, LT MLG UPLK UNREASON NEAR, RT GEAR DOOR LK UNREASON FAR. CHECKED GAPS AND INDUCTANCE FOR RT AND LT MLG DOOR NO DISCREPANCIES NOTED. REMOVED AND REPLACED THE PSEU AS A PRECAUTIONARY MEASURE. RETURNED TO SERVICE.