What is causing the door alarm and the interior lights to sporadically flicker?

Thanks. How do I test the switches? Are they easily replaced if they are bad?

EACH SWITCH NEEDS TO BE REMOVED AND CK BOTH SIDES FOR CONTINUENITY

At the risk of sounding like a girl (which I am)- Where are the switches? I opened the door and would it be near the hinge or inside where the hinge goes into the door or would it be on the other side of the door where the handle is and it closes. I really didn't see anything on that side though. Is there someplace on the internet I could see how to check it?

THEY MIGHT BE PART OF THE HINGE ASSM.YOU MIGHT WANT TO HAVE A MECH DO THIS SINCE YOU MOST LIKELY DON"T HAVE THE PROPER TOOLS. THEY SHOULD BE ABLE TO DIAG FAIRLY QUICKLY.WORTH THE FEW BUCKS IT WILL COST. THE TOOLS WILL COST YOU MORE

Sounds like a good plan. Thanks for your advice.