I suggest that, in the interest of safety, you have a licensed electrician look at what is there from the drop, through to the outlets/fixtures. Are the circuits properly protected with fuses or breakers? Some older homes have fuse boxes that accept any size (amp) fuse and the prior owner might have installed a fuse that is too big for the wiring. The open ground in a bathroom is a major "red-light" to me.
I would want to make sure there were no additional safety issues besides the open ground in the bath.
Good luck!
R2B
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