I'm testing new PSA appliances and started with the smallest one, PSA300.
There seems to be a small interoperability issue between the new HW and current 8.1rX release. I realized there are alerts about fan issue, dropping bellow threshold of 299 RPMs. I see this behavior on four different devices and two of them are RMA that was authorized via the TAC.
To me it seems that the new HW has some sort of temperature management and slows or switches off fans when they are not needed. That would be fine but there should be no hardcoded RPM threshold in the system.