I bought a head unit from Circuit City (that they installed) for my car two years ago. I purchased the 15 dollar protection plan at that time. I have two months left on the warranty. Recently, my head unit went bad. I have an appointment on friday morning for them to look at it. My question is this: They no longer sell the model I have, but it has been upgraded to a slightly more expensive model. If they do replace the unit because they can't fix it, do i have to pay the difference? I tried locating the terms and conditions of the circuit city protection plan but i cannot seem to do so. All i have is my receipt that says when my warranty is valid until.