(For those who might remember, I had the initial problem of the start sequence not completing. As I thought the A relay did in fact have the blades incorrect. I rebuilt all six switches per the schematic and all is good.)
So now the start sequence completes, the ball is ejected from the outhole and hits the though switch. The first ball count shows one -- all set to go -- but the motor doesn't stop. I can manually stop the motor by opening the 1A last switch or 6th switch and the motor will stop. All the many playfield switches connected to 1A are correctly open; a short with any of these switches (rollover, drop targets, etc.)would cause the problem but all are open.
The upsetting issue is I didn't have this problem before; it just started -- maybe as I moved the playfield up and down.
Any suggestions? Thanks for all the help so far.