I found mine leaking also but It didn't cause too much damage before I sealed It up, here are the pics of the engineered defect ( PT, Cheers to you genius
)If you look at most other manufactures slides you will see just a flat plain square cover over the miter joint along with flat aluminum extruded frame, not fancy but it can be sealed up nicely. Prime Time uses a fancy trim piece that looks nice along side fancier aluminum extrusions with vinyl inserts, well this looks very nice but it can't be sealed up for crap! the water is running into the slide via the small channel that holds the insert. I found mine to be only sealed under the corner trim and nothing under the vinyl insert
If your slide is built like ours Is I would keep your eye out for water infiltration.
After 2 1/2 years and doing our fare share of camping in this unit our Darco bottoms are still in real good shape but Im going to order and install the repair kits anyways just for some piece of mind!