What was found
A/T P/RST FLASHES YELLOW TWICE WITH THE FIRST SELECTION OF FLAPS. GROUNDED - YES. WITH INPUT FROM TECH SERVICES AND CFM SYSTEMS HANDBOOK SEC 4.020 PAGE 7 ACCOMPLISHED B737-9 IFIM 22-32-00-810-811 AT OPERATIONAL TEST AND B737-9 AMM 22-31-00-710-802 AT SYSTEM TEST AND BITE LIBRARY 50 MCP ALL CHECKED GOOD NO DEFECT. SYSTEM HANDBOOK STATES AT AMBER LIGHT INDICATES AIRSPEED DIFFERENCE FROM COMMANDED VALUE BY +10 TO -5KTS. DURING THAT TIME THIS CONDITION IS NORMAL.