As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3288 - CLE-GSO - AFTER TAKEOFF, AIRCRAFT ROLLED TO THE LEFT. DISCOVERED A 2000 LBS FUEL IMBALANCE, WITH LEFT WING HEAVY. AIRCRAFT AIR RETURNED TO CLE. MAINTENANCE FOUND RIGHT FUEL TANK DEFUEL VALVE SWITCH IN THE OPEN POSITION. CLOSED SWITCH AND TRANSFERED FUEL FROM LEFT SIDE TO RIGHT. SAFTIED SWITCHES. AIRCRAFT RETURNED TO SERVICE. (Z)