Thanks for the insight and feed back. I went ahead and ordered the new PLM last night knowing how old mine was and from other threads I read here. With Amazon Prime it showed up at 10 this morning. The feed back on the wall warts is good, and I find now that I did already have one that would likely work, but I also have an Altex not too far from the house so ran over there at lunch and bought a 5V 2Amp that fits the plug.
For some followup from other posts - I bought my 994i 3 years back and it likely could have come with a wall wart, but I don't remember it. I bought on one of the upgrade programs and got a good deal on it, so thinking it really didn't come with one. The information I posted about the ISY not needing a power supply if bundled with a PLM came right from a current description of the ISY, but I don't remember which web site. The 5 volt power adapter info comes out of the detailed manual for the ISY.
I used the method to Replace the PLM - it worked pretty well, it missed two switches, so I ran it again and it missed two more - so I cut my losses and just deleted those 4 switches and added them back manually. I have almost no linking information in any switch - I use programs to turn them on and off when I want via the ISY.
Other than a couple of switches that are several years old and have been given me problems it looks like I'm back up and running the programs this evening turned all of my lights back on which hadn't happened in two weeks. For now it's success.