Bad news is that it's no longer there.
Good news is that there is a new signal there with multiple channels. 3740/25319
Bad , but interesting news is that this transponder is playing havoc and doing some VERY STRANGE THINGS to my receiver, and to TSREADER. I've never seen the entries in TSREADER jumping around before like it's doing on this transponder.
I'm rebooting now, to see if it's a computer problem.