What was found
FLIGHT LEVEL 340, APROX 3:50 INTO FLIGHT, AP"A" DISENGAGED. CWR BELOW FMA RED A/P P/RST AND FMC P/RST YELLOW WERE FLICKERING ON & OFF AP WOULD NOT RE-ENGAGE CYCLED FLIGHT DIRECTORS AND WAS ABLE TO RE-ENGAGE THE AP. GROUNDED - YES. COMPLIED WITH B737-9 IFIM TASK 22-11-00-810-D22 FOUND MAINTENANCE MESSAGE 27-31025 COPLIED WITH IFIM TASK 27-32-00-810-829 MAINTENANCE MESSAGE DOES NOT SHOW ON GROUND TEST DISPLAY INTERMITTENT FAULT OPS CHECK GOOD.