Interesting, maybe I should bring that up. Shop foreman stated pretty clearly that's what it is (shifter module, the one that can get screwed up from spilling water in it, etc - which I did NOT do), but it was just done 15k ago. The trans has a new conductor plate and had the fluid done at 70k. Valve body has been removed now twice to change out other parts, but to my knowledge has not been replaced. That's all I know. No other shifting issues in the last 15k.