A call from a concerned citizen led to the arrest of an Arroyo Grande couple over the weekend. The call came into the Grover Beach Police Department on Saturday morning. When officers arrived on the 200 block of North 11th Street they made contact with 19-year-old Preston Scharf and 28-year-old Nikki Orellana. Officers learned that Orellana was on probation and had six warrants for her arrest. Scharff was also on probation. A search of his car turned up a loaded stolen handgun, five $100 counterfeit bills, heroin, drug paraphernalia and, two spring-loaded knives. Both are facing a number of felony charges.