You can look up the codes
here or manually under Show All possible options. Once you get the car you can lookup all the codes in Visible Tesla if no other way.
Yeah, there used to be more codes there. I don't think the contactors are problematic. The new drive units are due to the Model 3 going to be produced at 500,000 units a year. Those economies of scale are spilling over into the other models by the way of new parts. Also Tesla is governing all the drive units and batteries for not only safety but for product differentiation. I think the "uncorking" of the 75D is to give more folks a reason to stick with the more expensive cars.