As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX- ON TAKEOFF AT GEAR RETRACTION, NOTED RUMBLING NOISE. LEFT DOOR, NOSE DOOR, RIGHT UNSAFE (RED) LIGHTS APPEARED. COMPLIED WITH LANDING GEAR NOT RETRACTING CHCEKLIST. GEAR CAME DOWN WELL ON EXTENSION. AIRCRAFT LANDED WITHOUT INCIDENT. REMOVED AND REPLACED GRAVEL GUARD AND SWUNG LANDING GEAR. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.