It's gonna be interesting when we find where the miscommunication is occurring. The original Typhoon H, also know as H Pro or H480, came from the factory with monochromatic LEDs under the motors. They can't change colors. Typhoon H Plus, and the later TH series have multicolor LEDs. Some thoughts might be someone installed an LED from an Hplus or later, maybe the arm got changed out for an arm from a later model, or maybe you don't actually have a Typhoon H, and have one of the later models instead. So let's look at a couple things to try to figure this out:
1.) Does your LED have two wires or four wires running to it.
2.) Does the connector on your LED have 2 pins or 4 pins.
3.) Is your LED shaped like a rectangle with rounded ends, or is it slightly "T" shaped?
Also, you mentioned it was red "before". What changed between "before" and "now". Was any work done on that arm?