What was found
IAH - FLT 1691 - THE LANDING GEAR HANDLE WOULD NOT RAISE TO THE UP POSITION AFTER TAKEOFF FROM IAH. THE AIRCRAFT WAS RETURNED TO IAH WHERE IT LANDED WITHOUT INCIDENT. A GEAR RETRACTION WAS PERFORMED AND THE PROBLEM COULD NOT BE DUPLICATED. ADJUSTMENT OF THE GROUND SAFETY SENSOR CHECKED GOOD PER MM 32-09-01. THE LEVER LATCH ASSY WAS CLEANED AND LUBRICATED. IN ADDITION, THE R276 RELAY WAS REPLACED AS A PRECAUTIONARY MEASURE. (X)