I have a 2006 double slide Marathon XLII. In order to extend the front slide, I have to hold down the extend button for a short while--at which time I can hear air escaping the slide seal--but after that the slide won't extend. I then let go of the button & press it again in the extend position & the slide will then extend. This is starting to happen when retracting the slide also. It seems like I almost always have to give the button a "double hit" in order to activate the slide.
My procedure when operating the slides is to level the coach, have the engine running on high idle & front door open.

I recently had the coach in for service at the Marathon facility in Dallas & the lubricated the slide pin sockets--doesn't seem to have helped much.

Any ideas as to why this is occurring or am I in for a trip to Prevost?

Thanks in advance for your input.

Fred C