What was found
RT FMC FAIL IN CRUISE @ 2HRS. INTO FLIGHT. FL380 VTK/MAP SINGLE FMC OP. FMC SOURCE SELECT SWITCH BOTH ON L. FMC- R BEARING INFO ON POS SHFT PAGE NOT DISPLAYED. SINGLE FMC OPERATION. GROUNDED - YES. REVERSED MEL PROCEDURE AND PLACED FMC TO NORMAL. PERFORMED B737-800 FIM 34-61 TASK 801 FOUND MULTIPLE FAULTS FOR R/H FMC COMPUTER. #2 FMC COMPUTER DUMPED ALL SOFTWARE AND PF CREATING MULTIPLE MISMATCH FAULTS AS WELL. REPLACED #2 FMC REF B737-800 AMM 34-61-02/401 ALL TEST PASS FAULTS CLEARED.