Was this for a warranty repair? Bitmain's warranty repair track record has been pretty awful. When my S17s were still under warranty and failing, I sent one to them and it took 4 months to get it back. That was pre-covid, they just couldn't keep up with how fast their crappy miners were breaking.
The Bitmain authorized warranty repair service near me in the USA has been advertising off-warrany repair and there have been
several reports that people have successfully gotten hashboards and PSUs repaired. But I noticed a couple of weeks ago that their
advertisement on Ebay says they aren't taking any more repair orders because their backlog is too long.
Makes me wonder if the Hong Kong office is using covid as a convenient excuse, and the real problem is that in-warranty S19s are failing faster than they can repair them.
Good call to purchase spare PSUs. Next step is to pro-actively start looking for look for 3rd party repair service near you for when your hashboards start failing.