Here is an interesting one. We are presently on an extended trip that covers areas from sea level to over 12,000 feet. The bus has been parked from sea level to 9700 feet. At sea level up to 5000 feet both slides work normally. Above 5000 and to 7000 feet I get an error when trying to open rear slide. The error message translates to "cannot deflate seal." I checked the pressure and it is normal at 7-8 lbs. Above 7000 both slides have error message and very difficult to either put slides in or out. Then traveled back down to 5000 feet and slides work normally again.

Any ideas? Has anyone else had similar problems?

Thank you