Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 4°C. We apply continuously 139°C heat to the field 5x2
What is the temperature (rounded to whole numbers) in the field 5x1 after 74 iterations according to the Gauss-Seidel iteration

Field in the beginning

4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444
4444444444

Field after 4 iterations (rounded after 4th iteration)

11151425191163
1241643805127135
13828812208940187
1382352905933177
1361529413422136
13591620191495
124691111963
1234677642
1223344331
0111222211

Temperature in field 5x1 after 74 iterations: