Hello and Welcome Steve & Jan:
I have heard that some of the early Alpines slides rams were welded into the frame they melded some of the pad on the rams.
You will have to look at the pads when the slide is out. If they are melted the rams will have to be pulled and the pads replaced.
You can adjust the genslide if it is rubbing against the body when closed. On the bottom of the slide (Front end you will see a large nut with an adjustable Allen screw in the center) this will adjust the up and down movement of the front end.
You will also see the same adjustment on the kitchen slide. I hope this helps.