use some rubbing alcohol and wipe off the old grease..its full of dirt.. did it to mine and then put the white lithium grease on and it fixed it.. you have to get into there and remove the old grease and put some new grease on a cotton swab and wipe in in there real good.. close the door a few times and put some more on and then open and close it to get the grease moving around...
hope this helps.
