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 138°C heat to the field 8x4
What is the temperature (rounded to whole numbers) in the field 5x2 after 147 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)

69121313141312105
9162022232423232113
12202528303033404426
13222832343647709952
1323303436426110923786
142430343743568110857
13233034364048575934
12212730333538403621
9162023252627262112
58111213131413106

Temperature in field 5x2 after 147 iterations: