Ksbuell

Hi, I have a KSW 15 that has worked great for years. It powers up, well according to the led that lights up, it’s powered up. However their is no longer any sound output. I pulled the amp and looked for obvious issues like bulging or leaking caps and burn resistors, but didn’t see anything. I ran some cables from a dedicated amp that I had hooked up to the LFE output and the subwoofer is working. So I know my issue is with the amp. Any suggestions as what I should check or test on the amp? Any suggestions will be very much appreciated! Cheers