I need help with Lionel's whistle circuit board, part # 610-8633-010. This is the small board that essentially replaced the old whistle relay. I have two whistles that blow continuously. Lionel says the part is unavailable. Can anyone suggest what component may be bad on these boards and/or have a schematic of the board? I guess I am going to have to try to repair them
Thanks in advance for your help.
Don