my best guess is that there is salt creep that has built up in the airline.
i bet if the skimmer were removed and cleaned in warm water it would be fine,
pay special attention to the air line though for salt clogging it. especially right at the pump where the hose attaches.
let me know if that doesnnt work, and we'll seewhat else we can do.
Okay… so I pulled out the skimmer and we cleaned it up pretty good with just a toothbrush and water. I didn't know what to use for cleaning it so we just used water. I'm going to put it back in later and see what happens.