As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW INFLIGHT T732/04DEC - NUMBER TWO ENGINE START VALVE OPEN LIGHT ILLUMINATED. CAPTAIN SHUT DOWN NUMBER TWO ENGINE. RETURNED TO DFW AND LANDED WITHOUT INCIDENT. SINGLE ENGINE TIME 20 MINUTES. REPLACED STARTER AND START VALVE. SYSTEM GROUND CHECKED NORMAL OPERATION.