What was found
AIRCRAFT WAS NOT GROUNDED: THE LEFT CENTER TANK FUEL BOOST PUMP LOW PRESSURE LIGHT CAME ONWITH 700 LBS INDICATED REMAINING IN CENTER FUEL TANK. SUBSEQUENTLY THE LEFT MAIN TANK FUEL QUANTITY BEGAN TO DECREASE WHILE THERIGHT MAIN TANK FUEL QUANTITY STAYED THE SAME AS THE RIGHT CENTER TANK FUEL PUMP CONTINUED TO FEED THE REMAINING 700 LBS FROM THE CENTER TANK. EVENTUALLY A 1000 LB FUEL IMBALANCE DEVELOPED BETWEEN MAIN TANKS. THIS WAS CORRECTED BY FOLLOWING THE QRH. THEREWAS NO TURBULENCE ENCOUNTERED AND LOAD FACTORS WERE NORMAL THROUGHOUT. (OPEN).