You didn't mention anything about Alternator Noise on your first post. Was it there then, or did it become apparent after they replaced JUST the RCA's?

Ah, I believe this was my fault when I was troubleshooting the RCA's. After pulling out the sled and messing with it, the whine started to happen. This is what leads me to believe that the sled is the culprit, but they put a screw in it and grounded it. I may go with those noise suppressors from Crutchfield...