As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FUEL QUANTITY AND TOTAL FUEL QUANTITY INDICATORS CONTINUOUSLY BLANK OUT FOR ABOUT 11 SECONDS THEN REAPPEAR. GROUNDED - YES. 8 FLIGHT LEGS OF FQIS PROCESSOR FAULURE CODE 28-41109. RMVD & RPLCD FUEL QTY PROCESSOR UNIT REF B737-800 AMM 28-41-81. OPS NORMAL PER SAME. ETOPS GND VERIFICATION TEST PASS.