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Hello again,
Everything is possible, but what you have does not make sense to me. The magnet wire used to wind the 5V is thick, about a millimeter in diameter, so it's almost impossible to open it up. Is the wire exiting from the transformer a stranded wire? If so, there is a splice under the transformer's paper insulation that may be bad. If this is the scenario, cut back carefully the external layer of insulating paper on the power transformer and, after testing for continuity where the magnet wire joins the stranded wire, resolder the joints and check again.
The voltage test between the winding and ground does mean nothing, as this 5V winding must float with respect to ground to the full B+ voltage. So you should get 5V between the 2 wires composing the winding, voltages to ground are almost surely stray voltages.
Cheers
Giulio Maiocco
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