This link will take you to the "short version of the recall notice"
https://www.arfc.org/rvs/keystone/mo...92/recall.aspx
It looks like it is the 120 volt shore power connector under the trailer where the wiring transitions from the main frame to the slide. Apparently there were some trailers that had that wiring connection "improperly connected or improperly sealed" and water could enter the connection, increasing the risk of fire. At least that's what this version of the recall notice indicates.
It's probably not a difficult repair, but depending on your expertise with electrical connections, it may be something you want to defer to the dealership for repair.