As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED TO TECH CENTER THAT THE NR 3 RT LED GROUP WAS STUCK IN TRANSIT. LIGHTS ON FLIGHT ENGINEERS PANEL INDICATED GROUP IN TRANSIT WHILE ALL OTHERS INDICATED STOWED (GREEN) PERFORMED AIR TURNBACK. FOUND CONNECTOR FOR NR 3 RT GROUP DISCONNECTED. CONNECTOR WAS RECONNECTED AND NR 3 RT GROUP OPERATED NORMALLY PER MM 27-81-03.