The cache is NOT located at the posted coordinates.
If you have finished the Cambridge Street Art Adventure Lab, then you would have received a set of ten letters. Unscramble those letters to form a ten letter word and enter the word into certitude to receive instructions needed to solve the sudoku:

You can validate your puzzle solution with certitude.
Follow the solution instructions shown in Certitude to solve the following puzzle:
After solving the puzzle enter into Certitude the numbers without spaces for the row marked as '1' followed with a comma and the numbers without spaces for the row marked as '2'.

You can validate your puzzle solution with certitude.