What was found
AIRCRAFT WAS GROUNDED: CENTER TANK FUEL QUANTITY INDICATOR ONCE AGAIN BLANKED IN FLIGHT. FUEL TOTALIZER SUBSEQUENTLY BLANKED AS WELL. FUEL QUANTITY IN CENTER TANK WAS 0 JUST BEFORE INDICATOR BLANKING. **SUPPLEMENTAL REPORT FOR (AALA202506232718): PERFORMED FQIS BITE TEST PER AMM 28-41-00. TEST PASSED. PREVIOUS LEG REPORTS SHOWING ARINC OUTPUT BUS FAIL ALONG WITH PROCESSOR FAULT AND FAILED MESSAGES. T/S PER FIM 28-41-81. REMOVED AND REPLACED (FQPU)-FUEL QUANTITY PROCESSOR UNIT, PER AMM 28-41-81. OPERATIONAL CHECK GOOD**(CLOSED).