On the Subject of Letter Math

These numbers don’t look right to me.

This module consists of a display with a lettered equation on it and six numbered buttons. Press the correct button to solve the module. Pressing the incorrect button will result in a strike.

To find the correct button, convert the letters on the display into numbers (A=1, B=2, etc). Use these numbers to solve the equation. To solve the module, press the button which matches the solution of the equation. However, the numbers have been changed. In order to find out what the number actually is, modify each number’s value depending on its color. Use the following table and solve the module as normal.

Color	Action
Red	+ 13
White	- (Batteries * # of off indicators)
Blue	+ (# of on indicators - Last digit of serial)
Green	- (# of ports + # of port plates)
Magenta	- (# of modules on the bomb * 2)
Yellow	+ ((# of port plates - # of battery holders) * 3)