I'm repairing a piece of test equipment (HP E4351B), which has a shorted bridge rectifier.
The one which is in here is a CRB35F-040P. The 'F' means fast recovery. This particular part has been discontinued, but I can get numerous versions of the same part with "standard recovery" diodes.
Since this is a 60Hz power supply (the bridge is connected directly to a non-center-tapped ~120VAC secondary on the main transformer), I'm not sure why one would spec a Fast Recovery rectifier in this application. Especially since it seems to be fairly well filtered with ~3600uF of caps on the DC side.
My current plan is to just replace it with a mechanically-identical standard recovery bridge rectifier with at least as good of specs as this one. But before I do, I figured I'd ask to see if there was some esoteric electronic reason why this might be specified the way it is.