Sorry I didn't post a reply. I do have the car working now for several weeks now. All is good. So yeah, it was the interlock issue, but not with the service disconnects. It was the HV connector at the driver's side rear wheel. Basically, the Ford Service people totally destroyed that connector. Not only was the clamping latch busted, but the 2 tabs on both sides of the connector on the battery pack were busted off. That's what the mating connector interfaces with to clamp the connection down. So when I just pushed the connector on all the way, the car would go into drive.
So with all that figured out, I buttoned everything back together and started testing it. No issues. So I started driving it to work and back...about 10 miles each way...no issue driving, but everytime I finish driving or before driving again, I reach under and push the connector to ensure it is fully seated. On 2 occasions, it had wiggled out a little as I could feel the movement on the connector when I pushed down on it.
If it were just the latch on the connector on the end of the high voltage cable, that could be replaced...but the one on the battery also needed replacement. So what I did was to make two metal (stainless steel) brackets that uses the same screw holes that secure the connector to the battery. With those in place on each side of the connector, I ran a nylon wire tie between them to secure hold the connector in place. It has been holding tightly for that last few weeks. So now I just need to check it every couple of months to make sure everything is still firm and snug. So far so good.
I have a writeup with pictures over on the facebook forum along with another write up on replacing the contactor. It is worth signing up for that facebook group if you ever need help with anything.