Loud Noise, Mainly at Startup

I have a nearly one year old Goodman DSZC16 that makes a loud noise, mainly at start-up (loudest) but also sometimes during operation. This occurs in cooling and heating but more often (and more loudly) in heating. The noise is hard to describe but it involves the compressor and sounds like a noisy refrigerator at start-up but much louder. The unit also suffers from "Dirty Sock Syndrome" but only in heating during the defrost cycle.

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