State regulators levied a $50,000 fine against Pacific Gas and Electric Co. on Monday for failing to fix security problems at a San Jose power substation that were exposed by a 2013 sniper attack. The California Public Utilities Commission said PG&E had failed to safely maintain its Metcalf Substation, allowing burglars to breach its fence and steal $40,000 worth of equipment more than a year after someone shot up the facility. The commission’s safety and enforcement division found numerous gaps in security at the substation, including a lack of training for supervisors and on-site personnel. Security guards on duty at the substation either ignored or didn’t hear alarms that went off as the burglars stole construction equipment from the substation and an adjacent yard, the state agency said.