Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 28°C. We apply continuously 153°C heat to the field 8x3
What is the temperature (rounded to whole numbers) in the field 9x4 after 128 iterations according to the Gauss-Seidel iteration

Field in the beginning

28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828

Field after 4 iterations (rounded after 4th iteration)

4789910911128
7111415161720293823
8141820212435639852
915202224305110725189
91621232631477610957
10172124263038505633
9162124252832353320
8151921232426262212
611141617181817147
3678999863

Temperature in field 9x4 after 128 iterations: