Robert - There is Sterling Marine in Rancho. I WOULD NOT GET ANY WORK DONE THERE!!! I know some of the things the have done and they are NOT good. I take my boat all the way to Delta Sport Boat in Antioch. http://www.deltasportboats.com/index1.html
They have done me right so far.
If it is just parts you want I am sure Sterling can get what you need. Also the NOR-CAL rep for Sanger is Scott Pellaton. Give Sanger a call directly and they are always helpful http://www.sangerboats.com/
Hope this helps. Drop me a PM if you want to talk more