As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUELER SHOWED UP AT 1841Z WAS HAVING PROBLEMS W/THE FUELING PANEL. FINALLY GOT THE MAIN TANKS FUELED BUT COULDN'T FUEL THE CENTER TANKS. REQ AK MX AT 1910Z CENTER FUEL TANK QTY GAUGE IS INOP COCKPIT GAUGE IS WORKING. GROUNDED - YES. VERIFIED FUEL PANEL CENTER GAUGE INOP OUTSIDE. RMVD AND INSTALLED NEW CENTER TANK REFUEL QTY INDICATOR REF B737-900 28-41-61/401. PERFORMED SYS OPS TEST. CHKS NML.