What was found
AIRCRAFT WAS GROUNDED: FLIGHT CREW REPORT OF "CHECK FMC FUEL QUANTITY" MESSAGE ON FMC AND FUEL QUANTITY. ACCOMPLISHED BITE CHECK OF FQP, PER FIM 28-41-00-810-801 AND FMC, PER FIM 34-61-00-810-801. NO FAULTS NOTED FROM BOTH COMPUTERS. SUMPED ALL TANKS, NO SIGNIFICANT WATER NOTED USING RED DYE. STICKED ALL TANKS AND GOT AS FOLLOWS, ECAM SHOWS 8.07 15.26 8.43. PITCH -.5 ROLL .5, LH STICK 7 SHOWS 5.6 = 8231/ DEVIATION OF 161. RH STICK 8 SHOWS 2.2 = 8334/ DEVIATION OF 96. TOTAL DEVIATION OF 257. REMOVE AND REPLACED FQIS PROCESSOR, PER AMM 28-41-81, AS A PRECAUTIONARY MEASURE. OPERTIONAL CHECK GOOD. READINGS ARE THE SAME.