New Holland T8010 Manual page 1555

Software is Out of Calibration Mode And Park Brake Request is Still Active.
Cause:
Transmission clutches are at maximum pressure and the park brake is ON.
Possible failure modes:
1. Software issue.
2. Controller failed.
Solution:
Download latest software version for transmission controller.
The Park Brake is Commanded ON and Gear is Engaged, But There is No
Park Brake Request From Calibration.
Cause:
Transmission clutches are at maximum pressure and the park brake is ON.
Possible failure modes:
1. Software issue.
2. Controller failed.
Solution:
Download latest software version for transmission controller.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 73
FAULT CODE TRANS 74
55-4-28