As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FLIGHT 2509 RETURN TO THE GATE FOR A XFLOW PUMP CAUTION ILLUMINATED WHEN THE FUEL SYSTEM IS SELECTED TO MANUAL PRIOR TO TAKEOFF. MAINTENANCE WAS UNABLE TO DUPLICATE THE PROBLEM. GROUND RAN BOTH ENGINES AND THE SYSTEM TESTED NORMALLY. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. NO PARTS REPLACED.