Reversing Belt Direction on a Middleby PS640G

We just added a 3rd Middleby Marshall PS640G, but the belt was set to run left to right. I have swapped the belt direction and the sensor to be right to left, but I am not sure where the conveyor control board that I have to change the jumper on is.

If anyone can shed some light on which board that is, I would greatly appreciate the help.

should Swap Arm + and Arm - if i remember correctly thats how it was on the PS360

I’m new to this but I have a MM ps360 and the other night my ovens control panel started blinking and said open. When I hit the actual temp button it said 909. What could be the cause of this.