Dead Garage Receptacle (47 VAC)
	
	
		Greetings,
I apologize in advance because I know this is a loose connection type failure, however, I'm stuck in bed with a serious about of Pneumonia and my Niece needs some help.
What I have been able to find out from here is that the receptacle is the end of line receptacle.  The cable is a 14 AWG, copper.  The conductors are attached to the receptacle screws and are tight, but not to tight to un-wrap from under the screw.
My Niece cannot isolate the breaker because of the completed walls in the garage.  Also, the first receptacle in the possible string is a GFCI receptacle, that tests fine.
I would normally start working backwards pulling the receptacles out one at a time until I found the failure, but I strongly suspect that there is a flying splice somewhere in the circuit that a friend created to install a light.
Short of tearing the walls out to trace the circuit, I'm looking for suggestions.  I don't have a boro scope to loan her, I do have a tone generator which may help.  I'm not sure that I can explain to her how to wring out the conductors using a meter, but until I know the circuit is dead, I do not want her poking around hot wires with something sharp.
Suggestions please.  
I'm stuck in bed at least 2 or 3 more weeks, barring a miricale.