The cache is not at the coordinate listed, you must solve the puzzle to find the location.
Cryptarithms
Cryptarithms are a type of mathematical puzzle in which the digits are replaced by symbols (typically letters of the alphabet). For example:
9567 + 1085 = 10652
can be represented like this:
abcd + efgb = efcbh
The rules
- Each letter represents a unique digit.
- Numbers must not start with a zero.
- The solution is unique (unless otherwise stated).
The puzzle

This is a log only cache, so you will need to supply your own writing implement!