Tried the board trick with my Adventurer with HWH slides and levelers. Bent the slide frame really bad. Call HWH and get their help. In short, their system maintains positive pressure in both directions on the slide. When you have a bad seal on the inbound solenoid the 'hold in' pressure bleeds off, so the outbound pressure pushes the slide out. The temp fix is to run the slide in, brace with boards, then release the pressure on both the inbound and outbound sides by turning the bleed screws on both the solenoids. The trick is to figure out which two solenoids to use. Fix is replacing solenoids at about $100 each.
Good Luck
