I suspect you have a broken shear pin. A mobile repair service should be able to replace the jack easily. They can use a bottle jack and jack stands to take the weight off the jack and remove it. On my jacks there are four big bolts holding the jack on the chassis plate. You can see two of them on the left side of the pic above.
If this is the problem the jack leg just falls out of the jack when removed.
I was lucky, my pins always broke when the jacks were raised all the way. What happened then was the jack leg just fell to the ground. All I had to do was wire it up to be able to move.
This
will happen again, I'd keep the jack. Even if the repair service does not have a pin you can get one from Atwood and have it the next time one breaks. PM me for my contact if you want to pursue this. If your tech knows how to fix Atwood landing gear he should easily be able to replace the pin. It cost me $20 for a tech to take apart my jack and knock out the bad pin, I got the new pin and put it back together. The next three I did myself.
Here and
here are posts from Tiffin owners who have had the same issues, it looks like Tiffin helped defray the cost.