Do you get cold air when the outside unit is running ?

yes, so I don't think it is a refrigerant leak - am I right, there?

If I were you, I'll check if the 24V is sent to the contactor while the condenser is stopped. If it is, then it is contactor problem, if not, then trace back to the T-stat to find out where the 24V is stopped.

Could be overheating, wrong coolant charge, bad contactor relay, or a host of other things. Unfortunately, this is one of those times you might want to call someone in to check it out.

I'll look for part diagrams on this unit and investigate further, but this is sounding beyond my capabilities. I can sometimes get by with diagrams, but I'm pretty clueless on HVAC.
I may be back on if I go further, or give up an call a repair person. I appreciate everyone's help!

You are not participating in any kind of power company "saving program" are you. We tried one years ago but I couldn't handle it.