Thanks Guys. It was the transfer switch. I removed the cover, everything looked normal (to the untrained eye). I rapped it a couple of times, plugged back in and power came up normally. Cycled it several times with genset on and off and all seems to be normal.
Now the question is, is this hung up relay just a transient thing or can I expect it to reoccur with increased frequency? Is there any adjustment that can be made, or should I just plan on keeping the rubber mallet handy??
Thanks again, Ken