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 148°C heat to the field 9x4
What is the temperature (rounded to whole numbers) in the field 5x1 after 35 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
9162022232423211813
12202528303030303329
13222832343436446074
132330343637425798210
14243034363842526879
13233034363740434536
12212730323334343020
9162023242525231911
5811121313131295

Temperature in field 5x1 after 35 iterations: