Drain Old Hydraulic Fluid from Cylinder

What happens here

Using the adjustable wrench, carefully loosen and remove the fill plug from the hydraulic lift cylinder. Attempt to add hydraulic fluid using the prepared soap bottle. The bed may not immediately operate or may appear overfilled, indicating old fluid might need to be drained first. If fluid starts spilling out or the bed doesn't move, prepare a drain pan and carefully loosen the drain plug (or fully remove the fill plug if it's the only access) to allow the old, likely contaminated, hydraulic fluid to drain into the pan.

Goal: Remove old hydraulic fluid from the lift cylinder.