What was found
AT CRUISE FL 360 HAD A/P DISCONT & "VTK" DISPLAYED CA PFD. ROUTE DATA WAS REMOVED AT APPROX 20' SEC DATA RESTORED "VTK" REMOVED FROM PFD - NORMAL OPERATION RESTORED. GROUNDED - YES. VERIFIED LAST FLT FMC L/H HAD AN INTERMITTENT FAULT. (PRES POS LAT RATE) AT 2159Z. WHILE CHECKING SENSOR STATUS OF BOTH FMC'S BOTH SHOW MISMATCH, VERIFIED BOTH FMC'S HAVE SAME SOFTWARE & PERFORMANCE FACTORS. CYCLED A/C PWR FOR 2MIN. ACCOMP FMC SENSOR STATUS ALL SHOW OK & FIX OUTPUT SHOW OK REF B737-9 AMM 34-61-00-710-002 & B737-9 IFIM 34-61-00-810-918.