Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 18°C. We apply continuously 173°C heat to the field 9x3
What is the temperature (rounded to whole numbers) in the field 5x6 after 119 iterations according to the Gauss-Seidel iteration

Field in the beginning

18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818

Field after 4 iterations (rounded after 4th iteration)

3456666577
47910101110132226
591113131416285378
61013141516224396236
6101315161722366182
6111415161721273533
6101315161718212216
59121415151616149
479101111111195
2455666542

Temperature in field 5x6 after 119 iterations: