Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 26°C. We apply continuously 115°C heat to the field 7x5
What is the temperature (rounded to whole numbers) in the field 2x4 after 87 iterations according to the Gauss-Seidel iteration

Field in the beginning

26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626
26262626262626262626

Field after 4 iterations (rounded after 4th iteration)

4688999863
610131415151514116
813161819202122179
8141821222533403116
9151922253557865626
91520232845892018735
9151922284064936129
8141720243142493819
6101315172126272212
35789111212105

Temperature in field 2x4 after 87 iterations: