GC76J1K Double Duty #3 (Unknown Cache) in Colorado, United States created by MonteLukast

MonteLukast: Will put this one to rest. Got a new job and haven't had time to go out there.

A cache by MonteLukast Message this owner

Hidden : 5/31/2017

Size: Size: micro (micro)

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Geocache Description:

This cache is not at the above coordinates.

Enjoy this new series. I'm pretty sure you can guess what the commonality is.
Just solve this puzzle to find the cache:

ZASTGTGL
STEZLZQT
GLSTEZLZ
QBALZTFQ
HQZTUQZ
TETUAUQF
TAZQIQSA
PLHQIQSA
AZQBALZT
PADSFQHQ
ZTEFLN

Additional Hints (Decrypt)

Pbyrznx

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)