As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. EMERGENCY DECLARED. DFW-TUS FLIGHT RETURNED TO DFW ACCOUNT CREW REPORTED A POSSIBLE FUEL LEAK/INDICATION ISSUE. OVERWEIGHT LANDING UNEVENTFUL. FOUND CROSSFEED VALVE OPEN. FLIGHT WAS SERVICED, REFUELED AND RE-DEPARTED. OPERATIONAL CHECK GOOD.