Please Help

I 20190408_150352.jpg have a 2010 ford focus 2010 2.0 diesel in Philippines. My bro took it to a ford dealer mechanic. I attached the paper what they did. It wasn't that bad when I took the car to them. Now the error code keeps coming on after a few kilometers. Now they want to take the transmission down and take a look at it. Please help. Thank you.