Outwest, my understanding is that a single pump failure will manifest itself as a lower oil pressure.
Sikorsky are currently working on a modification that would give the crew a more obvious indication of pump failure. The modification is a result of the vespel spline problems, etc previously covered.
Does any other aircraft out there have a MGB oil pump fail warning system? Not trying to make any particular point here, just curious......
Cheers
VL