A former Marshfield bus driver had his felony sexual assault charge reduced to two misdemeanors before he reached a plea agreement.  Three witnesses had just offered testimony against 53-year-old Herbert Andres in court Tuesday.  He was accused of making sexual advances on a 17-year-old girl at a New Year’s Eve party held at his home.  Andres will be on probation for two years after serving 30 days in jail.