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 61°C heat to the field 7x2
What is the temperature (rounded to whole numbers) in the field 2x9 after 57 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)

47899111519147
7111415172234493215
81418202332551145121
9152022263345594019
9162124263136393016
10172124262931302413
9162124262728262011
815192123242421168
611141617181715116
3678999863

Temperature in field 2x9 after 57 iterations: