What was found
#2 FMC FAIL (VTK LNAV DISCONNECT, SIGLE FMC OPERATION) DESCENDING THRU 10,000 MSL. SEEMED TO SELF CORRECT BUT AND WAS SLOW TO RECEIVER. POSITION SHIFT TO THE RIGHT WAS VISUALLY EVIDENT ON FINAL TO 35 EVEN THROUGH AND WAS WITHIN LIMITS FOR THE 2ULU RNWY APPROACH TO 35. POS SHIFT 3/3 WAS AS FOLLOWS:VFMC-L 119%0.4NM FMC-R 300Ï¿½ 0.2NM GPS-L 118%0.4NM GPS-R 119Ï¿½0.4NM IRS-L 063%1.1NM IRS-R 218Ï¿½ 2.3NM RNP.30 ANP 0.36 SCRATCHING MSSG: VERIFY POS: FMC-GPS GROUNDED - YES. RAN B737-800 FIM 34-61 TASK 836 CHECKED POWER TO FMC'S OPS RESTORED, CHECKS OKAY REF FIM 34-61 TASK 801, B737-800 AMM 34-61-00.