My Yocto2 was working great until I lost CB, CY, OH and CH. They're triggering, I can hear a faint click and adjusting the delay on the OH does fade it out. I can't spot any bad solder joints or burnt components.
This previous topic (viewtopic.php?f=27&t=1610) turned out to be a bad Q9. I swapped in a known good one but no change.
Any help?