My recently deceased father-in-laws kitchen cabinets have a finish problem. Some doors have yellowed, others retain the original frost color - about half of the cabinets have this problem. No rhyme or reason to it - one is fine, the one right next to it is bad. American Woodmark won't honor warranty - claim it isn't transferable - even though deed hasn't actually changed hands yet. Would anyone have any ideas on a quick/simple fix to this type of problem??