And so it proved. Cleaning the reflector was a 30 second job and all is well again.

 

I noticed that the 4 plastic reflectors from the optical box sit directly behind each toner cartridge and are accessible without having to remove the optical box to get to them.

I HIGHLY SUGGEST WIPING OFF THE PLASTIC REFLECTORS BEHIND EACH TONER CARTRIDGE BEFORE TRYING TO TAKE APART YOUR PRINTER.

It is very likely that wiping the four thin plastic reflectors behind the toner cartridges with some dry Q-Tips or cotton balls will correct the color issues