Repainting/refacing kitchen cabinets (tenant versus landlord)

Hello my landlord is suggesting I owe 3000 dollars for kitchen cabinets refacing/repainting. Attaching some pictures here.  

I rented this house for 4 years, it was a new home when I started renting. 

Do I have to cover this fully, is landlord responsible for half the charges or something like that? Thanks for your responses. 

Here is their comments: 

Cabinets surface excessive filth and original enamel is completely gone. Estimated cost to fix: $3K

Here are some pictures.