Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 40°C. We apply continuously 126°C heat to the field 6x4
What is the temperature (rounded to whole numbers) in the field 3x8 after 70 iterations according to the Gauss-Seidel iteration

Field in the beginning

40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040

Field after 4 iterations (rounded after 4th iteration)

69121313141413105
9162022232628261910
12202528334252443015
132228344671105754521
13233039581072331115826
142431395482115845225
13233037466070604121
12212732384448423116
9162024273031272010
58111214151513105

Temperature in field 3x8 after 70 iterations: