Red = R
Yellow = Y
Blue = Bl
Green = G
Orange = O
Black = Bk
The cache can be found at:
N51 18 (R) (Bk - G - R + Y) (G x Bl - O)
W 0 33 (Bl - Bk) (Y) (Bk x 2 - R)
You can check your answers for this puzzle on Geochecker.com.
Please replace cache exactly where you found it; initially I placed it from a different position and dropped it and it was very hard to retrieve. It should be straightforward from where it is now.