As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMBER RIGHT SIDE FUEL QUANTITY + TOTAL FUEL DISAPPEAR INTERMITTENTLY. HAPPENED 3 TIMES AT CRUISE, THEN OPERATED NORMALLY. GROUNDED - YES. RAN FQIS BITE REF B737-800 FIM 28-41 TASK 801 LOGGED TANK 2 PROCESSOR FAIL MSG 28-41209. R & R FQPU, OPS CHECK OK REF B737-800 AMM 28-41-81 PB 400.