As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLT FUEL IMBALANCE CAUTION MESSAGE POSTED ON EICAS TOT FUEL DECREASED FROM 4900 TO 4000 IN 30 SEC THEN TO 3000 IN 45 SEC TOT FUEL THEN INCREASED TO 3900 AND REMAINED THERE FOR THE REMAINDER OF FLT. ACFT DIVERTED DUE TO MX -- EMERGENCY DECLARED --REF DEFECT 525788 R & R FUEL QTY COMPUTER IAW AMM 28-41-16. OPS CK GOOD.