This is a long shot

I am completly stumped. Six months ago the tile guy was cutting bathroom tile in the garage and popped a breaker (I thought). I checked all circuts and none were tripped. I then looked closely at the outlet and it had a little sticker identifying it as a GFI protected outlet. No problem I said, I simply find the tripped plug and reset it. Six month later I still can't find it. The plug by the sinks in the upstairs bathroom is also on this circuit. I have searched high and low and cannot find a tripped GFI plug anywhere. I have taken my tester to every plug in the house and still no luck. I changed out the garage plug without any success. Looked in the attic, the basement and outside to no avail. Out of desperation I called the builder of the house (12 years old) hoping to locate the original electrician in case he could remember - no luck, retired and moved to florida. Any ideas short of completely rewiring the bath and garage plugs?

Desperate in Atlanta,

Carmine