We had a similar problem in our 1st home in TV, which was a designer (Gardenia). In our case, it was a new home, that we moved into in December. One bedroom was consistently 5° colder than the rest of the house. All other areas in the house were within 1° of each other. We called Warranty about the issues, and they promptly sent Munn's out to investigate. After checking the output air temps at all registers, which were all good, the tech broke out his thermal imaging camera. He found that the bedroom in question showed very obvious cold areas on the ceiling. Specifically, the area from the outside wall about 3' into the room was noticeably colder. A trip into the attic confirmed there was no insulation blown in the attic from the outside wall, to nearly 4' into the room, for the entire width of the room. Two days later, the insulation contractor was on site to correct the issue, and the problem was instantly solved.
Long story short, even though Warranty may not apply, call a reputable HVAC company and have them do a thorough inspection. There is no way a 6 year old home should need to have it's ductwork cleaned.
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