I had a S17+ repaired by Core Scientific
I recommend them. Works great. Needed 7 new chips installed. Great experience and very professional.
I had the opposite experience with Core Scientific. S17pro went in limping and came out of their facility much worse. Add insult to injury, it took over two months, when it was returned a heat sink was loose inside the box, and under a stereo microscope, one side of the PIC chip wasn't even touching it's pads after I assume they reflowed (had to resolder this myself and still doesn't work). The first diagnosis was all temp sensors were bad at a quote for $400 to a PIC, Boost circuit, some temp. sensors were bad on two boards - that were then deemed "unrepairable", $129. From my experience, there is one point of contact there - he is knowledgeable and professional when you are able to talk to him. As of Nov. 2020 they had 6 techs. there.
Repair Initiation: A
Diagnosis: D
Customer Service while in repair: B
Actual Repairs: F
Pricing: B
Last night s17+ turned off. Only hashing on 2 chains instead of 3 now. Emailed Core to see if I need to send it back or what to do. Will report back. I can get 50 tH out of it for the time being. Sounds like this is a common issues with the s17 series. Super frustrating.