Flashing lights on fridge. Slide out works intermit tingly.

Visual inspection first. Look for bad/loose/burned connections. Indications of heat at slide relays/terminals and wiring. Look at fuse panel for any signs of heat. Be sure batteries and connections are good. Corrosion can hide.

I would then use a volt meter at the slide motor and work your way through it with a wiring schematic. Check amp draw as slide moves, it may indicate a tight area without disassembling.