Transistor on AC 7040 electrical

Have narrowed a trans temp light to be either a loose wire to warning light or a transister. The manual does not show location of transister. I would think it would be behind instrament panel. Is this correct?
 
Apparently hooking and unhooking the wire at the sender doesn't do anything?

I can't recall if those tractors had individual warning lights, or if they were in a "module". If individual, power to the light, a good sender, and an intact wire between the light and sender was all I remember. If module, that can be tested with a "suitcase" module (mostly for Gleaners) tester, hopefully at some nearby AC dealer.
 

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