So, not sure exactly why I need to post a discussion in a thread here for warranty work. I guess its because most of your users are inexperienced?
I have 45 + years in RC, I know RC servos.
I developed software professionally 35+ years. I know software.
I am doing robotics in retirement, spiked3.com, I know robots.
So I have a DOA servo, buzzed for a while, got real hot (odor hot), never moved at all.
Pretty sure it is a bad servo, but we can discuss it if you'd like
It is one of the (visible) servos I can see without a 'QC passed sticker', some have the sticker some do not.