As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERMITTENT SIGNAL INDICATION ON RT FUEL QUANTITY. BLANKS AT TIMES THROUGHOUT FLIGHT WHEN OPERATING, APPEARS TO PROVIDE ACUTE INDICATION. TOTAL FUEL INDICATION APPEARS ACCURATE AT ALL TIMES. GROUNDED - YES. PERFORMED OPS TEST OF FQIS B737-800 FIM TASK 28-41 TASK 801. FQIS BITE OPS CHECK NORMAL & FIM 28-41 TASK 813. FUEL QTY. INDICATION BLANK TEST. OPS TEST NORMAL.