Well, the flipper has stayed on through a good number of games and I did check and clean out the switches. I pulled the board out and continuity was good on my new soldered clips.
Now, T-Rex has started confusing his left with his right. In manual diagnostics, he will move left and sometimes right. When behaving correctly, there is a "ting" as he activates and goes to the right (if I have the coin door open, I can hear it. Sometimes, though, no noise and right flipper makes him go to the left. If I give the cab a slap on the right (like keeping the ball out of the slings), I hear the noise and right flipper again returns Rex to the right.
I looked through this thread and someone else had a similar problem but I didn't see any solutions and that poster hasn't been on the forum in over a year.