2005 ford focus zx4 se...shoulder belt adustment

hi all,
i have a new focus and noticed this morning that i cannot adjust the shoulder belt height on the driver/right side seatbelt. its stuck in the
up position and cannot be lowered after depressing the button.
any ideas on how to fix it/make it move, besides taking it to the dealer. i have had the car three months with very low miles. its going to be a while before the dealer looks at the car for its 3000/5000 miles maintenance inspection/oil change.
thanks in advance,
bob brozewicz.
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