Unifi Switch Fan Noise

I’ve got a Unifi 48 port POE 500w switch running FW Fans seem to tick up to 70 after about 10 min run time. Temp hovers around 52C, CPU 66%, low load (for testing just have 3 devices connected one is POE). I’ve got several other similar switches in production same stats except their fans are almost always at 50. Much lower noise. I’ve tried downgrading to several prior FW versions. Same issue. Any ideas? Why would this one switch differ from the others in this way? Thoughts? Lastly, where can I see/run a diagnostic and view results? The controller version is 6.0.28 and shows no issues on switch.