As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CENTER TANK FUEL IS EMPTY FOR THIS FLIGHT. ON TAXI OUT, GOT FMC MESSAGE VERIFY FUEL AND GROSS WEIGHT ON TAXI OUT CENTER TANK QUANTITY INDICATOR BLANKED, JUST BEFORE RETURNING TO GATE, CENTER TANK QUANTITY INDICATOR RETURNED. GROUNDED - YES. REMOVED FUEL QTY PROCESSOR PER B737-800 AMM 28-41-81-000-801. INSTALLED FUEL QTY PROCESSOR UNIT PER AMM 28-41-81-400-801. PERFORMED FUEL QUANTITY IND SYS OPS TEST PER AMM 28-41-00-710-801 OPS TEST PASSED WITH NO FAULTS.