Jediwannabe,
In your position I would phone SDS. I don't have international on my Verizon cel but spoke with a rep a couple of weeks ago to get the cost/min.: 60 cents.
All things considered, I would take clear pics of the problem, email those to AA, ask him to name a convenient time to talk, and then call him. For such an investment, it's worth the ~$20 it may cost to speak to him, directly.
Think back on any environmental factors that may have affected it since you've owned it. Was anything sprayed onto the surface, even accidentally?
Since there is a crack, the plastic may, at some point, have come into contact with a solvent, which may cause both discoloration and stress corrosion cracking.
Allan