What was found
DURING CLIMB A FUEL LIGHT WAS NOTICED ON THE LEFT FUEL TANK QUANTITY THE LEFT QUANTITY WAS 7.5 AND THE RIGHT QUANTITY WAS 8.5 THE CENTER WAS 22.5 ALL FUEL PUMPS WERE SELECTED ON AT THE TIME, AND THE CROSSFEED VALVE WAS CLOSED. WE RAN THE FUEL IMB CHECKLIST WHICH HAD US TRANSFER MAIN FUEL UNTIL BOTH WARMS EVEN AT 7.5 AND THEM RESUMED NORMAL OPS. GROUNDED - YES. C/W FUEL BOOST PUMPS OPERATIONAL TEST IAW B737-800 AMM 28-22-41. TRANSFERED FUEL FROM WINGS TO CENTER & BACK TO WINGS. NO DEFECT NOTED.