Looking at pictures of the M335, all the slides appear to be Accuslides. As already stated, you can look in the tools tab for information on these slides. For emergency retracton, Heartland would have provided a flex shaft (about 1 foot long) that attaches to a drill and the other end is placed on the motor shaft. You use the drill and flex shaft to turn the motor to move the slide. The not so good news is that the motor is typically placed on the wall behind the facia above the slide box. Assuming that is where they are, I believe you may have to remove the facia to gain access to the motor.