AWS Network Engineering contact?

I have a direct connect via Coresite LA1 over to AWS via US West 1, and a customer with VPC's in the east that are getting really bad throughput transferring files via the direct connect. We've isolated it to being an issue behind AWS's PE over a barely utilized 10G XC. Would anyone happen to know what the right starting point to contact someone in AWS Network Engineering? We can replicate the issue at will. Current discussions are to see if we can get anywhere with AWS Network folks, or potentially go rebuild the direct connect / VPC's over in US West 1 to bypass most of the cross-country AWS backbone, but that's a fair amount of work to *maybe* resolve the issue? Peter -- Peter Serwe http://truthlightway.blogspot.com/