Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 9°C. We apply continuously 84°C heat to the field 5x3
What is the temperature (rounded to whole numbers) in the field 8x9 after 77 iterations according to the Gauss-Seidel iteration

Field in the beginning

9999999999
9999999999
9999999999
9999999999
9999999999
9999999999
9999999999
9999999999
9999999999
9999999999

Field after 4 iterations (rounded after 4th iteration)

1233466532
24471320171273
3471431543621125
351022551396029157
36101938614225157
3691523312719126
358111518171495
35781012121074
2456787652
1223344321

Temperature in field 8x9 after 77 iterations: