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 85°C heat to the field 9x1
What is the temperature (rounded to whole numbers) in the field 8x1 after 138 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)

46889910152535
61013141516182751118
8131618192022283744
8141821222324262721
9151922232424242113
9152022242424231810
915192223242422179
814172021222119147
610131516161614105
3578898753

Temperature in field 8x1 after 138 iterations: