Light brown areas on 2006 ASE

I have a 2006 20th Anniv. Silver Eagle set graded 69 by PCGS. Question: the reverse side of two of the coins have: one has light brown discoloration the other has light brown spots.. not white spots, are the problems acceptable to PCGS within the 69 grade? I may submit them to PCGS for money back ane the return of the lower graded coins or correct the problem. Comments.....
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