As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FMC VERIFY FUEL AND GW MESSAGE ON SCRATCH PAD. WENT TO PERF INIT PAGE AND FUEL LINE DISPLAY DASHES. AFTER 10 SECONDS FUEL LINE DISPLAYED CORRECTLY, OCCURRED TWICE. SECOND OCCURRENCE WAS AT SAME TIME AS CENTER TANK REACHED ZERO QTY. ACFT GROUNDED. REPLACED FUEL QTY PROCESSOR UNIT REF AMM 28-41-81-000-801 AND 28-41-81-400-801; ACCOMPLISHED OPS TEST, REF AMM 28-41-00-710-801, TEST PASSED.