What was found
AT APPROXIMATELY 500 FT, THE AUTOPILOT WAS SELECTED ON, ONLY YAW DAMPER ENGAGED, LANDING GEAR AIR GROUND FAIL MESSAGE DISPLAYED ON EICAS. APPROXIMATELY 20 SECONDS LATER, NR 1 & 2 ENGINE REVERSERS DISAGREE MESSAGE DISPLAYED ON EICAS. OPS CHECK OF THE AIR - GROUND WOW SYSTEM GOOD AT THIS TIME IAW 32-60-00. FUNCTIONAL CHECK OF THE PROXIMITY SWITCHES USING BREAKOUT BOX GOOD IAW 32-63-05. NO ERRONEOUS MESSAGES NOTED. OPS CHECKED OF THE THRUST REVERSERS WAS GOOD IAW 78-31-01. NO ERRONEOUS MESSAGES NOTED. OK FOR SERVICE.