PG&E repeatedly ignored safety concerns raised by its employees in the years before the deadly San Bruno explosion, and the workers were sometimes punished for speaking up, according to lawsuits against the utility and interviews with the workers…PG&E declined to comment on the employees' charges -- some of which have never been publicly revealed -- because they constitute personnel matters, according to company spokesman David Eisenhauer. He insisted, however, that "we absolutely do not tolerate retaliation of any kind. We absolutely encourage any employee to raise concerns at any time."