From previous 2020 post: (This can be found on the forum using the "search" function)
I jacked up my kitchen (refrigerator) slide from the outside using a small bottle jack and wooden cribbing to the frame of the slide. I could only do 1 end at a time, but this worked OK for me. There is about 2-3 inches of clearance on the vertical trailer side cutout for the slides.
I did remove the slide front bottom wood trim. I had to do some of the repair laying on the inside floor in front of the slides, removing the roller from its frame to access the mounting screws (simple C clips on the roller axle), loosening the mounting screws with a right angle screwdriver some, and then using a thin nose vicegrips pliers to rotate the screw head. I may have used a 1/4 inch screwdriver bit held in the thin nose vicegrips instead of the right angle screwdriver.
I noted that the roller under the refrigerator was NOT located under the center of the refrigerator weight, and I relocated the new roller to under the center of the refrigerator. I think I also added an additional roller to help bear the weight.
The roller is called a J-38 which you can look up on the internet.
Check E-Bay or other sources for a J-38 RV slide roller:
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