Marcia,
Both of the slides on the 335RLBS are hydraulic. Here is a link with a picture of the location of the pump and tank:
http://www.geocities.com/fulltimedre...pumplocat.html
Its good to know where the pump is located. A year or so ago I had one of the DC "breakers" go out in the line that runs to the pump. There is a hexagonal connector on the end of the pump to which you can connect a portable drill. I used my drill to put the slides in and out until I could trouble shoot the electrical problem. Its not cool when you're trying to break camp and your slides won't retract. The manual on the slides give very good directions.