A 51-year-old ex-firefighter accused of sexually assaulting three women — including while he was on duty in Temecula — will ask a judge Wednesday to consider lowering his bail so he can get out of jail. David Renteria III of Placentia was arrested in April following a Riverside County Sheriff’s Department investigation initiated last fall. Renteria is charged with four counts of forcible rape, two counts of sodomy and one count each of kidnappin…