No, the Partner Mail placement in slot 2 is correct, since the ACS is in the center slot, and the 1st expansion module (the 206) is in slot 1.

Here's the bypass switch:
[Linked Image from touchtonetommy.com]
Pins 1&2 are either Telephone Company Dial Tone, or a Single Line Intercom Only station from the Partner
Pins 3&4 go to the IN of the Door King
Pins 5&6 go to the OUT of the Door King
Pins 7&8 go to a CO PORT on the Partner, NOT a station port.

In the Bypass mode, the dial tone on 1&2 just goes to the phone/CO port on 7&8. Entry mode puts the Door King in the loop, just like an alarm RJ-31X