'97 SC2 transmitter board needed

I need to find a transmitter board (# 10C236) for a GM 16207901-5; model AB01502T remote key fob. Is there anyone out there who may be able to help? Used is fine, as long as there aren't too many years of use on it. Mine has over 15 years;dealer gave me a used board yesterday. Now, I can't set the alarm (not able to electronically lock doors). Thanks.