Hello there, my 2nd hand 33220A S/N starts with MY44*
It runs firmware:

While last available FW on keysight site is generically "2.07" build date 2009-08-24.
I'm a bit confused whether mine could be the most up-to-date version available or not, since it reports also "2.06"...anyone can check his ? (
Utility -> Test/Cal -> Cal Info )
Also, anyone did replace the fan on the back and got the specs ? Mine is really noisy and would gladly replace it, say, with a Noctua or any other compatible silent Fan...
Tnx
Andrea