I have had my PRO-91 scanner for about 12 years and it has always worked great. I have not used it for a few months and then when I go to turn it on, there is no sound. I also tried to plug in earphones and still no sound. I do have the squelch all the way up as well, still cant here a thing. I partially disassemblled the unit and checked the speaker connections but found nothing. Has anyone had this problem or have any ideas?? Thanks for your help!!!