After CBS removed MG from its lineup in April of 79, it continued to be seen on WCBS in NY and KNXT in LA. As you may or may not know, I collect old issues of TV Guide and the ones from New York never had a panel listing, so I could not figure out what was aired.
However, I just came into possession of a few issues from LA from the summer of '79 which do list the panels, so I guess if I throw out some names, I could find out if they were reruns, "never-aired" episodes or syndie versions getting an LA airing before the formal rollout.
Here goes: 5/28-29/79-Bert Convy, Patti Duke Astin, Audrey Landers, BS, CNR.
5/30-6/1-Nipsey, Dick Martin, Dolly Martin, BS, CNR, FF.
7/9-7/10-Bart Braverman, Barbara Rhodes, DM, BS, CNR, FF
7/11-7/13-Guich Koock, Betty White, Paul Williams, etc.
8/13-14-Jack Jones, Loni Anderson, Joyce Bulifant.
8/15-17-Don Galloway, Lee Meriwether, Bill Daily.
9/4-Bill Cullen, Marcia Wallace.
9/5-9/7-Orson Bean, Bill Daily, Dick Martin, Brianne Leary, FF.