I have an 97 850 wagon with an SC 815 "premium" sound system. After having work done very shortly after purchasing it, I used the code to resurrect the unit, and now it won't accept cds! It takes them in, tries to read them, and inevitably spits them back out after a few seconds. It worked great before it was disconnected from the battery. Any suggestions will be much appreciated (I already tried to find the microswitch that's on the SC 816, but couldn't locate it on mine).