Just had similar problem over Memorial day holiday. There are MANY posts on this forum detailing with the issue of leaks in the Lippert pump seal. I can't say for sure that you have a Lippert pump on your rig, but there has been a long history for several years of these pumps blowing the seal where the motor shaft goes into the pump. When that happens, you get all the symptoms you describe, including the puddle under the rig, and eventually the pump quits working, and if yours is like mine, the motor burns up. Unfortunately, you are no longer in warranty, and if this is your problem, and you don't have extended coverage, a replacement pump and motor is about $1,200.00.
However, this thing is pretty easy to repair and I followed the great directions that were posted here by Happycarz
Lippert Seal Replacement
and repaired my in a couple hours. I had to get a new motor, since mine was burned up, but it was covered by warranty, otherwise $600.00.
Other posts dealing with this issue can be found here -
Lippert Hydraulic Pump Issues
And my story about fixing mine can be found here -
LCI Hydraulic Pump - Good Experience
As for retracting the slides now, there is an emergency procedure. Monaco supplies a tool, which, hopefully, you can find in your coach. It's a chrome flexible drive shaft that is designed to provide torque to spin the motor shaft and bring in the slides. You need a socket to put on one end to engage the nut at the end of the motor shaft and an electric drill to spin the drive shaft. It didn't work for me, because the pump was too far gone, so the other method is to crack the hydraulic lines loose where the go into the pump manifold and let some fluid drain out. This will release all pressure on the slide pistons, and you can then push the slide back in. It can be done pretty easily with two folks so long as the coach is level. My wife and I did ours, even the long one.
Once you get the slides back in, you will need to secure them with a cargo bar. On my coach, Monaco was kind enough to supply ONE for the two slides. So, we had an exciting time when the curbside decided to deploy on it's own half way home. There is a post here somewhere that describes that fun trip, but suffice to say I now carry TWO cargo bars.
Feel free to PM me if you have any questions.
Regards and best wishes,