Slide works its way out while stored.

Hi, it has been at the repair place for 2 weeks, and finally got word on the issue. No fault was found with the operation, so the tech called the factory to see if they had a suggestion. They said check the pressure at the pump, it should be 2200 psi. The tech ordered in a pressure checker that could measure the very high pressure, and it did show that it did lost pressure over night.
Now the bad news, the pump,tank and electricals only come as a complete assembly at about $1200 plus shipping markup, labor. The lead time is likely two weeks.
The tech has tried to source parts, but no luck.