What was found
ON DEPARTURE OUT OF ATL ON A RNAV DEPARTURE & LNAV/VNAV ENGAGED ON TAKEOFF ROTATION LNAV & VNAV BOTH DISAPPEARED & WE LOST F/D GUIDANCE. WE TURNED BOTH F/D OFF, THEN ON & REENGAGED LNAV & VNAV WHICH WORKED. THEN CLIMBING OUT OF 15,000 FT VNAV DISENGAGED & FMA WENT INTO CWS PITCH. VNAV WOULD NOT REENGAGE RIGHT AWAY, WE TRIED VNAV SEVERAL MINUTES LATER GOING THROUGH 27,000 FT IT WORKED FOR REMAINDER OF FLIGHT. GROUNDED - YES. "A" DFCS LOGGED MSG 22-11822 - FMC DATA INVALID. FMC TESTS GOOD REF B737-900 AMM TASK 34-61-00-710-801. "A" DFCS TESTS GOOD PER AMM TASK 22-11-00-740-815.