Member Details Mark Serpa - Custom Locksmith & Alarm Inc. Share: Locks & Locksmiths Mark Serpa - Custom Locksmith & Alarm Inc. Visit Website Request Info 522 E. Main St. Turlock, CA 95380 (209) 668-3606 (209) 668-3706 (fax) Map What's Nearby? Distance: 5 10 15 20 25 50 mi.