transmission temp sensor light ??

Hi, What can anybody tell me about this sensor ? Its on a 94 3.9 auto se. Is it just for the t/box or the actual auto box ?. The reason I ask is having recently purchased the car I noticed this light flickering then going off completely, but today has come on from cold so surely a dodgy sensor ? where is the sensor, can it's connections be cleaned/tested or easily replaced ? Has anyone else had this prob ?Any info would be greatly appreciated. Cheers Dan