Face forward - even if not moving forward

About 2 years ago a small cable shorted and burned out a channel on the mixing board at my church. It wasn't a major issue since we had a spare channel to use and the dead one was just taped up.

I got the schematics from the national distributer of this mixing board and tried working on it myself to save our church spending some big cash. Couldn't find anything obvious as to why it was dead. Left it until I went on vacation in late July and took out just the dead channel strip to the national service depot on the edge of Toronto. After a couple of weeks, they call back and say it's fine. The technician suggested a few other things to try - all of them time-consuming.

I put the channel strip back into the mixing board and thought, "Why not just see what's going on?" I plugged in the wireless microphone as per usual and fired up the board. No flashing lights. No smoke. Good so far. I turned on the mic, turned on the channel - and it worked! But I don't know why. I experimented with different types of inputs and they all worked. Humph.

Just hope it stays that way.....