What was found
AFTER CLEARING RUNWAY LEFT FMC BEGAIN CYCLING BETWEEN VTK AND NORMAL INDICATIONS. THE FMC IS STILL CYCLING WHILE SITTING HERE AT THE GATE. GROUNDED-YES. VERIFIED FAULT, OPEN 2 C/B'S & INST 2 MIG51A'S. REPLACED LT FMC WITH SERVICEABLE ONE. CLOSED 2 C/B'S & REMOVED 2 MIG51A'S ACCOMPLISHED FMC DATA CROSS LOAD RT TO LT. APPLIED PERFORMANCE FACTORS & FMC OPERATIONS TEST, TEST PASS, REF B737-800 M/M 34-61-02-400-801, 34-61-00-800-801, & 34-61-00-710-801. SEA/MC NOTIFIED RAY.