Picked up a few old mobiles (Cobra 21 23 Ch, loud little sucker! realistic mini 40, midland 77-106 with scan mic) really cheap yesterday but the one i really wanted was the Cobra 32XLR! However, it transmits one channel high on every channel. I looked at the board and it is untouched. So is there a can i can tweak to get this old mobile back on the regular 40? It has excellent receive and seems to talk rather well.