This might be a do it yourself job. Look at the track, if there is an accumulation of 'crud' try removing with an old toothbrush. If this is from hard water, some vinegar, or CLR will be very helpful. Also, there are usually drip holes or slots opn the inside of the track, make sure these are clear.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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