Darn, I forgot I had pictures of the repair. So for what it's worth...
Jeff, the repair manager called me before the repair and said he had good news. The supplier (who aparently controls warrantee replacements), had said they didn't have the specific "Thermal eXchange Valve" (TXV) available for my unit, but that he "bitched and complained" and they agreed to provide a whole "coil".
I had no idea what that meant, but if the repair manager was happy, that seemed good. Well, it was more significant than I thought! The TXV seems to be that little gold colored thing in the center. The "coil" is the entire guts of the inside unit!
The replacement units are not IDENTICAL to the original ones. He had to cut away some side sheet metal to make it fit. But HE knew about that and repairguy didn't... I can only imagine (with shudders) what repairguy would have struggled to do to make it fit. Hammerring maybe?
BUT, after 3 days of switching the system from heat to cooling, the system is working better than I recall from the initial installation. There MAY have been problems from the start. I dropped the temperature from 72 to 68F in 30 minutes. That used to take an hour. Raising the temperature is faster, but it happened faster than usual.
I am glad of this repair.
But I think the success was all because I complained to the company first about problems with the previous repair, and then the Repair Manager when I was not pleased with the repairguy they sent. And Repair Manager did almost all of the work himself! Let that be a lesson to you... Demand the best-qualified person to do the job...