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 196°C heat to the field 3x8
What is the temperature (rounded to whole numbers) in the field 3x7 after 66 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)

6912131314131295
916202223242321168
12202528303030272011
13222832343434302312
13233034373736322413
14243342444239342613
13284969635344362613
1540841401006849362412
1750128324142744530199
11316711675442717105

Temperature in field 3x7 after 66 iterations: