The code I gave you is the one you would use to program the Replay remote itself (though as you can see, I was puzzled why you would need to).
You are in a JP1 forum. All the remotes here are made by UEI and sold under brand names like "One For All" and "Radio Shack" plus several OEM remotes (like your Replay remote).
We would have no idea what codes would be needed for non-UEI remotes like your Zenith, and we're such snobs here anyway that we think all other brands of universals are a load of crap anyway!
So, if you want a good universal to work your Replay, get an OFA model. Specifically, get the URC-6131 PVR remote. If you want a JP1 compatible version, get it from me as I sell modified URC-6131 remotes, and I can also sell you a cable.