Bob,
Page 199 (Equipment Section 5) of the 2005 Monterey owner’s manual discusses the slide-room hydraulic pump/reservoir location. Also, you will see images of the hydraulic reservoir, pump, and solenoids. If you don’t have an owner’s manual, you can find one in the ‘Coach Assist’ section
Here’s a couple of excerpts from the HWH Operator’s Manual (not the Monterey manual).
Note: Hold the switch to "EXTEND" three or four seconds after the room is fully extended. This assures proper pressurization of the cylinders.
IMPORTANT: Do not hold the ROOM CONTROL SWITCH in the "EXTEND" position for more than ten seconds after the room is fully extended (and down if applicable) or stops moving.
As Steve mentioned, the most important thing to do first is check the fluid level, THEN try this.
Hold the EXTEND switch down for three or four seconds after the room is fully extended (release the switch if the pump starts to squeal). Sometimes this will help clear the problem if the room creep is not caused from a leak, O-ring issue or defective solenoid. I’ve had this technique work but sometimes it’s just a temporary “fix”. I would do the same for the RETRACT operation to clear any debris that may be present.
-Scott