WHERE IS THE AIR VALVE THAT CONTROLS THE STAIRWELL COVER?

[Jack and Liz Pearce]

Howdy.
The stairwell cover on our 1993 Bird can't make up its' mind on what
it wants to do. Sometimes it will extend and then immediately retract.
Sometime it will NOT extend. Sometime it will extend about 3/4th of
the way over the stairwell.

Ideas, suggestions as to how to fix this problem would be appreciated.

We are in Thermopolis, WY. Beautiful country.

Regards,
Regards,
Jack and Liz Pearce
Fulltiming in a 1993 Wanderlodge WB40