Lifting the coach off a jackstand on our level driveway in front of its hangar, I inadvertently ran the rear jacks to their full extension, something I avoid doing. When they retracted, the left remained partially extended. By re-extending the right, and initiating a tandem retraction, both eventually came up. But, the left jack pours hydraulic fluid anytime extension is selected, and doesn't move.
Today, using Power Gear guidance, I removed the jack from the motorhome and began disassembling the unit, which they recommend doing prior to making any determination about repairs/rebuild.
For a good reason, it turns out: After unbolting the leg and extending it manually, it suddenly hung up; forcing extension revealed hideous damage from what appears to be a pin or bolt inside, along with multiple scratches. Either fault demands replacement of the entire unit, says Power Gear.