What was found
IAH - FLT 0423 - SEVERAL WARNING LIGHTS ILLUMINATED DURING TAKEOFF FROM IAH. THE TERRAIN WARNING, AUTOPILOT DISENGAGE, WINDSHEAR, ALL THREE ENGINE OIL LIGHTS, HYDRAULIC LIGHT, AILERON, RUDDER, AND ELEVATOR LIGHTS, AND MASTER WARNING LIGHT ALL ILLUMINATED. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. THE M833 AND M981 MASTER DIM AND TEST MODULES WERE REMOVED AND REPLACED. IN ADDITION, THE MASTER DIM AND TEST SWITCH WERE REPLACED. AN OPERATIONAL CHECK OF ALL WARNING LIGHTS WAS NORMAL (X)