Air Step problem - will not completely extend without 'help'

[rogerwwebb]

My air step is hanging up during extension (opening) and is not fully
extending without 'help' from my foot, shaking the step a bit. No
problem with retraction (closing).

Lubricating all pivot points did not help.

Air expels during the opening and closing process, as is normal. Once
the step is locked into place, either open or closed, it stops.

However, when the step hangs up (partially open) air continues to expel
from what I believe to be the step solenoid valve. In particular the
escaping air is coming from one of the two 'spark plug shaped' devices
on the bottom of the valve.

Advice appreciated ... and if someone could give me the proper name of
the 'spark plug shaped' devices, that too, would be appreciated.

Roger Webb
91 WL
Cedar Rapids, IA