I just replaced ours. The push/pull lock on the inside unscrews. there are three screws that need to come out. The springs are easily available at Home Depot in a kit of three sizes. Kit number 685-436. pick the right two and they swap out pretty easy. Ours rattled pretty bad and now the door closes tighter and no more rattle.
Marty Schemel KJ4WUV
2005 National Sea breeze