I have a 2012 Arto 79R and over the last few weeks the hab door closing mechanism has started to become lazy. This is a 2 stage mechanism which pulls the door fully closed after the initial door closure. Sometimes it works first time but on other occasions it is necessary to close the door 2 or 3 times before the pull in closing mechanism activates. Please does anyone have any useful insights as to how this mechanism actually works and any servicing tips. Thanks in advance. David.