Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 28°C. We apply continuously 71°C heat to the field 0x8
What is the temperature (rounded to whole numbers) in the field 6x3 after 53 iterations according to the Gauss-Seidel iteration

Field in the beginning

28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828
28282828282828282828

Field after 4 iterations (rounded after 4th iteration)

47899109863
711141516171615116
814182021212119147
915202223242421168
1017212425262523179
1219232526262623189
1824262626262623179
3835292625242320158
10047292320191715115
3124171311109853

Temperature in field 6x3 after 53 iterations: