Is there a filler piece in the run?
Otherwise you need to clamp a straight egde to the cabinet and use a circular saw with a 40 tooth finish blade. Put painters tape on the face of the cabinets to protect the finish and from chipping on the cut.
That is a ton of work, but
Post a picture or 2 of the area maybe there are other options
Last edited by BrianKiernan; 08-16-2010 at 06:26 PM.