I have a 2001 Dolphin with a living room slide out & a bed room slide out. The living room slide out I can get to the gears to clean & lube. But the bed room slide out is covered up inside & outside...
If it's anything like my old Fleetwood with Powergear, the bedroom slide was powered by a self contained motor/gearbox that was connected to the shaft. No lubing needed , but you could lube the grads on the shaft, but since they are enclosed inside the bed base, they never get dirty or loose lube.. You had to take the mattress off the bed and remove a couple sheets of plywood that formed the bed base to get to the workings of the slide.