Afer using a hair dryer in the bathroom, lost power to receptacles in both the bathroom and 1 bedroom. Wierd thing is, the 15 amp fuse that powers those 2 rooms also powers another bedroom, which is ok. I know that because if I pull the fuse, there is no power to the 2nd bedroom either and also no power in receptacles in 3rd bedroom. When fuse put back, power good in 2nd and 3rd rooms. I tightened all connections on all receptacles and light fixtures. In the 1st bedroom light fixture, there are 3 black wires, 3 white wires, 1 red wire, and grounds to the box. I have 120v on all 3 black to neutrals, 120v at 1 neutral to ground. The rest are 0. Where to go from here? I made a few holes in the bathroom walls and found 12/2 gauge alum wire used. I was also able to peek in the attic crawl space, and saw some 14/2 wire.. Cannot pinpoint which is which?? Any thoughts would be greatly appreciated. Thanks in advance..