Can any one tell me if the wood square panel like pieces under the 1/2 sidlites of an entry door can be repaired or replaced. The 1/2 window parts of the sidelites are fine and completely sealed, but the wood panels (squares) underneath the windows area are showing signs of deteriation (ei. spliting &t hining). One home improvement store clerk informed me that I may have to replace the entire door frame unit if it's a whole manufacture unit, however the door frame still seems to be still very sturdy. Again, just wanted to know if it is possible to repair or replace these wood panels within the entry door sidelites?