Prostar with Ultrashift - Shifting Problems

I have a 2012 international prostar with the eaton ultrashift 10 speed auto tranny and I got code 56, which is the input shaft speed sensor. I purchased the sensor but have had conflicting information given about how to access it to repair it. I was told to remove passenger seat and pull out flooring and there was a plate there to access and then I was told to access it from under the truck on the passenger side of transmission.

My VIN is 3HSDJSJR5CN582932. Any help or diagrams you can offer would be very helpful and greatly appreciated. Thank you

 

Answer is yes or yes. Easier to do #2 if you are (1) thin (2) young.