I replaced the breaker, I checked all outlets, switches and fixtures all appeared to be OK. Junction boxes also looked ok. I vaccumed drywall dust out of everything - nothing.
The first connection from the panel is to a light switch w/dimmer. The wiring looks fine but I didn't check continuity could this be the problem?
The only other thing I can think of is I drove a screw into the wire somewhere. Is there a way I can test to determine where the short may be??