Janesville police are investigating an early morning break-in at one bar, and an attempt at another.  Police responded to a pair of alarms around 4:00 a.m. Thursday.  Officers found evidence of an attempted burglary at a bar in the 1600 block of Racine Street, and forced entry of a side door at an establishment in the 1000 block of Rockport Road.  No word yet if anything was stolen.