Hi, well I would expect a larger access panel than what you are describing from inside the coach.....if that was how the slide drive system is actually accessed and if the access is under the couch (may be hidden some other place under the slide like basement compartments). If you can identify the manufacturer somehow you could check their systems from 2006 and perhaps even get a maintenance manual from them.
The 2007 general Manual I attached previously talks about the hydraulic pump being in the front driver side compartment bay (if its the same as your 2006 it might be there). Does your hydraulic pump valve body look the same as the one shown in the 2007 manual? When you operate your slide does the hydraulic pump motor start running? I think this style valve body controls jacks and slide(s) as required (8 valves per side). If it looks like what you have in your coach, see if a manufacturer name is tagged on it and do some research on line. HWH was a making slide hydraulics in 2006 I think. There are some videos on You Tube to help identify the slide types as well. Any name on the slide control panel? Lippert may have had electric slide systems and controls in 2006. Being an RV owner involves being a detective in many cases......looking for clues until the big break tip comes in.
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