Hello, I just purchased an '81 DeLorean vin#06163. The "FM" button on the radio does not work (you push it but the radio stays in the AM mode). Any idea as to what might be the problem? I ordered the Craig Service Manual hoping that it may have some suggestions in it. Any thoughts will be appreciated. Thanks, John L. Rahn RotorWay A.C.I.S Exec 162F N818JR