As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NEAR TOP OF CLIMB FL340 NOTICED LH MAIN FUEL TANK SHOWED 900LBS LOWER THAN RIGHT (WITH FUEL IN CENTER) . IMBAL LIGHT CAME ON. RAN IMBAL QRH AND FUEL LEAK QRH. NO FUEL LEAK. FUEL REMAINED LOWER IN LH TANK UNTIL AFTER TOUCHDOWN AT WHICH POINT FUEL IND ON LH TANK INCREASE APROX 700LBS. GROUNDED - YES. PERFORMED FQIS BITE TEST PER B737-800 FIM 28-41-00-810-801. NO FAULTS ON CURRENT STATUS & INFLT. GROUND TEST IS GOOD. NO FAULTS HISTORY. A/C OK FOR SERVICE.