The cache is not at listed coordinates. First you have to do a little brain excercise and then a small walk through the Phoenix park.......
Hitori
A - When the number 4 in the 7th line is in the white square its value is 4+1, when the number is in the black square, its value is 4-1
B - number of black squares in the 10th line
C - add together all numbers in a black squares in the 1st line
Final coordinates
53.Ax(A+B).(C/B)0
006.(C/B)+A+B.(C+(2xB))(A+B)
The cache
The cache contains only logbook, please bring your own pen . Please rehide it well to prevent many muggles from discovering it.