Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 31°C. We apply continuously 107°C heat to the field 9x6
What is the temperature (rounded to whole numbers) in the field 3x3 after 145 iterations according to the Gauss-Seidel iteration

Field in the beginning

31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131
31313131313131313131

Field after 4 iterations (rounded after 4th iteration)

47910101110974
712151718181816126
915192223242321169
10172225262726231913
10182326282828272824
11182427282930354755
101823262829324372153
9162123252629364756
7121618192021242623
468910101112129

Temperature in field 3x3 after 145 iterations: