Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 27°C. We apply continuously 64°C heat to the field 3x5
What is the temperature (rounded to whole numbers) in the field 7x5 after 77 iterations according to the Gauss-Seidel iteration

Field in the beginning

27272727272727272727
27272727272727272727
27272727272727272727
27272727272727272727
27272727272727272727
27272727272727272727
27272727272727272727
27272727272727272727
27272727272727272727
27272727272727272727

Field after 4 iterations (rounded after 4th iteration)

4689999863
611131516161614116
813182222222118147
916253332282522168
1022395947363024179
12285712365433326189
1125436350393125189
1019303836312722158
713192323221916116
47911121110863

Temperature in field 7x5 after 77 iterations: