Well I know questions about RS headlamps have been posted many times on this & other web sites.I have read most of them.I was wondering if there is a "Check List" of problems & a diagnosis.Im just finishing a restoration on my Z10 & my doors not opening will hold me up.I was prepared though as I did not install the grill & front tires. There are so many things that could keep my doors from opening& closing Im not sure where to start.I have used all my original parts except new hoses & check valve.They worked fine years go but.. Any help is greatly appreciated