Selling pre-owned FRM3.
I believe this part has now been succeeded by P/N 61359286887
Most places I've seen them $310-$340
Priced for a quick sale @ $160, and I'll include Shipping at no cost.
If you can pay via Chase Bank Epay knock it down to $155 shipped.
Paypal OK, just not preferred.
That is not discoloration by defect or substance, it looks like the shell is a composite of some sort.