What was found
FMC DISAGREE MESSAGE DURING TAXI BEFORE DEPARTURE & SELF RESOLVED. RIGHT FMC FAILED DURING DESCENT & SELF RESOLVED W/IN 10 SECONDS. FMC DISAGREE MESSAGE TWICE ON TAXI IN SELF RESOLVED BOTH TIMES. GROUNDED - YES. THE RT FMC HAD ONE FAULT: " PRES POS LAT RATE I " ON FLIGHT LEG 1. ACCOMPLISHED ADIRS L & R CURRENT STATUS AND INFLIGHT STATUS BITE, NO FAULTS RECORDED. ACCOMPLISHED FMC L & R COMPUTER C/B RESET. OPERATION OF FMCS RESTORED WITH NO " FMC DISAGREE " MESSAGES. REF B737-900 FIM 34-61 TASK 835. GROUND VERIFICATION SUCCESSFUL.