This is just a simple puzzle in downtown Erie. To find the final cache, visit the posted coordinates and find a four digit number. Use that number to fill in the missing numbers of the final coordinates:
N 42 07.5AB W 080 05.1CD
A = The second digit in the number you find.
B = The third digit in the number minus one.
C = The second digit in the number plus one.
D = The first digit in the number.
I wouldn't recommend trying to find this one at night.
Good luck and have fun!