I’ve reconnected my electronics and I no longer get the EEPROM read failure message. Maybe there was something shorting it. Additionally, the both left and right motors are now passing the motor test.
However, when I attempt the chain calibration step – sprocket to high noon adjustment-- the sprocket moves both CW and CCW, maybe toggling seven times between the two directions. I’ll search the forum to see if others have had a problem with sprocket alignment.