Was it really off the air, or was the PSA loop the intended content?
My initial thought was that is was a channel only seen on an FTA type unit, but I checked my commercial burn sheet and I saw it listed, exactly as you reported.
Good eye!
I see in my listing an HD station right below tagged as 206-3 on 887.
They both show on TP 23 on 82. Maybe CBC-W HD
Also FTA-1 and FTA-2, so what's up with that?
So it looks like 3 SD + 1 HD for that TP.