find_mistakes.py

import pandas
import numpy

arr = numpy.triu(numpy.random.randint(-10000, 10000, (175, 175)))
arr = arr.transpose() + arr

# Add mistake
arr[152, 8] = 10

rows, cols = numpy.nonzero(arr - arr.transpose())

print("Company 1, Company 2, Value")
for row, col in zip(rows, cols):
    print(f"{row}, {col}, {arr[row, col]}")