As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: 1000LB FUEL SPLIT AFTER 15MIN OF FLIGHT THE CENTER TANK EMPTY AND RIGHT SIDE WAS LOW; THE SPLIT COULD NOT BE BALANCED AND GOT WORSE AND WORSE. AIRCRAFT DIVERTED TO AND LANDED SAFELY AT CLT. FOUND CENTER TANK TRANSFER VALVE SWITCH IN OPEN POSITION. CLOSED VALVE AND EXERCISED DEFUEL VALVE. RAN WING TANK PUMPS FOR 15 MINUTES. NO FUEL TRANSFER NOTED.